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A Curing System of Intramolecular Polyalkyne Polyurethane and Polytriazole

A technology of alkynyl polyurethane and polyurethane prepolymer is applied in the field of two-component polytriazole curing system, which can solve the problems of narrow adjustment range of mechanical properties and single method, and achieve excellent mechanical properties, simple process, and insensitivity to formula measurement. Effect

Active Publication Date: 2021-06-04
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of single material structure regulation method and narrow range of mechanical property regulation in the prior art, the object of the present invention is to provide an intramolecular polyalkyne polyurethane and its synthesis method

Method used

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  • A Curing System of Intramolecular Polyalkyne Polyurethane and Polytriazole
  • A Curing System of Intramolecular Polyalkyne Polyurethane and Polytriazole
  • A Curing System of Intramolecular Polyalkyne Polyurethane and Polytriazole

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Taking formula parameters Rt=0.95, H%=30%, Cp=1.0 as an example, the implementation method of the two-component polytriazole adhesive curing system is as follows:

[0054] (1) 50g polyethylene adipate (diethylene glycol adipate) (molecular weight Mn=2000) and 16.75g isophorone diisocyanate are added in the reaction flask, N 2 React at 80°C for 2 hours under atmosphere to obtain polyurethane prepolymer.

[0055] (2) Disperse 4.68g of butynediol in 35.72g of ethyl acetate, add it to the polyurethane prepolymer obtained in step (1), react at 80°C for 1h, add dilauric acid di-n-lauric acid with a total mass of 1wt‰ butyl tin, and continue to react for 10 hours until the isocyanate content is 0 to obtain a hydroxyl-terminated polyalkyne polyurethane resin solution.

[0056] (3) Get 30g of the polyalkyne-based polyurethane resin solution obtained in step (2), add 2.01g of cross-linking agent 4,4'-bis(azidomethylene)biphenyl, fully mix and place in a vacuum oven The solvent ...

Embodiment 2

[0058] Taking formula parameters Rt=0.90, H%=30%, Cp=1.0 as an example, the implementation method of the two-component polytriazole adhesive curing system is as follows:

[0059] (1) 50g polyethylene adipate (diethylene glycol adipate) (molecular weight Mn=2000) and 16.49g isophorone diisocyanate are added in the reaction flask, N 2 React at 80°C for 2 hours under atmosphere to obtain polyurethane prepolymer.

[0060] (2) Disperse 4.94g of butynediol in 35.72g of ethyl acetate, add it to the polyurethane prepolymer obtained in step (1), react at 80°C for 1h, add dilauric acid dilaurate n-Butyl tin, continue to react for 8 hours until the isocyanate content is 0, and obtain a hydroxyl-terminated polyalkyne polyurethane resin solution.

[0061] (3) Get 30g of the polyalkyne-based polyurethane resin solution obtained in step (2), add 2.12g of cross-linking agent 4,4'-bis(azidomethylene)biphenyl, fully mix and place in a vacuum oven The solvent was removed in the medium, and the...

Embodiment 3

[0063] Taking formula parameters Rt=0.85, H%=30%, Cp=1.0 as an example, the implementation method of the two-component polytriazole adhesive curing system is as follows:

[0064] (1) 50g polydiethylene glycol adipate (molecular weight Mn=2000) and 16.21g isophorone diisocyanate are added in the reaction flask, N 2 React at 80°C for 2 hours under atmosphere to obtain polyurethane prepolymer.

[0065] (2) Disperse 5.23g of butynediol in 35.72g of ethyl acetate, add it to the polyurethane prepolymer obtained in step (1), react at 80°C for 1h, add dilauric acid di-n-lauric acid with a total mass of 1wt‰ butyl tin, and continue to react for 8 hours until the isocyanate content is 0 to obtain a hydroxyl-terminated polyalkyne polyurethane resin solution.

[0066] (3) Get 30g of the polyalkyne-based polyurethane resin solution obtained in step (2), add 2.25g of cross-linking agent 4,4'-bis(azidomethylene)biphenyl, fully mix and place in a vacuum oven The solvent was removed in the m...

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Abstract

The invention relates to an intramolecular polyalkynyl polyurethane and polytriazole curing system, which mainly includes the following contents: (1) reacting oligomer diol and diisocyanate to obtain a polyurethane prepolymer, and then using butynediol to obtain a polyurethane prepolymer. As a chain extender, a polyurethane resin containing multiple alkynyl groups in the molecule was synthesized; (2) a two-component polytriazole adhesive curing system was combined with a diazide curing agent and a polyalkynyl resin. The two-component adhesive can be cured at 70 °C for 7 d, 10 h at 110 °C, and 6 h at 130 °C; the tensile strength of the prepared two-component polytriazole elastomer ranges from 1.45 MPa To 15.89 MPa, the elongation at break is flexibly adjustable from 190% to 953%. As a new type of two-component curing system, the formulation development and curing of the invention are not restricted by environmental humidity; the invention has the characteristics of more insensitive formulation measurement, milder reaction conditions and broader mechanical properties.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to synthesizing an intramolecular polyalkyne polyurethane and forming a two-component polytriazole curing system with a diazide curing agent. Background technique [0002] At present, in the field of composite solid propellants, hydroxyl-terminated resins and isocyanate curing agents are mostly used to form a curing system. Since isocyanate is easy to react with water, the formulation development and charge quality are severely restricted by the ambient humidity. [0003] The reaction between the azido group and the alkynyl group is a dipolar cycloaddition reaction, which is a typical "click" reaction. The reaction conditions are mild and not affected by water. The triazole ring formed by the reaction has certain rigidity and excellent energy performance. It has a good application prospect in composite solid propellants with high energy and low signature. [0004] Since the German ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/76C08G18/66C08G18/42C08G18/48C08G18/32C08G18/10C06B25/00
CPCC06B25/00C08G18/10C08G18/425C08G18/4825C08G18/755C08G18/7614C08G18/3206
Inventor 邓剑如刘思萌李通情张平安谢进波李泽国
Owner HUNAN UNIV
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