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Method for determining relative rate of curing reaction of glycidyl azide polymer adhesive

A technology of glycidyl ether and curing reaction, applied in flow characteristics, measuring devices, instruments, etc., can solve problems such as interference and undetectable heat, and achieve the effects of easy operation, fast and simple data processing, and saving chemical reagents

Active Publication Date: 2019-05-24
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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  • Abstract
  • Description
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for judging the relative rate of the curing reaction of a polyazide glycidyl ether (GAP) adhesive, which can overcome the above-mentioned shortcomings and avoid the characteristic absorption of isocyanate groups in the infrared spectrum The peak is interfered by the characteristic absorption peak of the azide group, and the heat released in the thermal analysis method cannot be detected, so that the relative rate of the curing reaction of the GAP adhesive can be determined simply and quickly.

Method used

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  • Method for determining relative rate of curing reaction of glycidyl azide polymer adhesive
  • Method for determining relative rate of curing reaction of glycidyl azide polymer adhesive
  • Method for determining relative rate of curing reaction of glycidyl azide polymer adhesive

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Embodiment Construction

[0030] In the following, the present invention will be further described in conjunction with the embodiments.

[0031] (1) Weigh 20g each of the three GAP adhesives with different hydroxyl values, put them in three beakers, add 0.06g of the catalyst triphenylbismuth, stir evenly, and the ratio of the amount of isocyanate group to hydroxyl group is 1 :1 accurately add 1.16g, 0.73g, 0.42g toluene diisocyanate respectively to form three curing reaction systems GAP-TDI-1, GAP-TDI-2 and GAP-TDI-3 continue to stir to mix the curing reaction system Evenly, immediately put it into a 50℃ oil bath oven for curing reaction.

[0032] (2) At different time points in the curing reaction process, take out a small amount of samples of the curing system GAP-TDI-1 from the oven, use a rheometer to immediately test the viscosity of the sample, and continue to cure the other two systems in the oven. The same test is performed on the curing system GAP-TDI-2 and the curing system GAP-TDI-3. The freque...

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Abstract

The invention provides a method for determining the relative rate of the curing reaction of a glycidyl azide polymer (GAP) adhesive. The method includes testing the viscosity values of the GAP adhesive and a curing agent at different times in the curing reaction according to a rheological method; according to the Boltzmann equation, acquiring a time-dependent curve of the viscosity and each parameter in the equation through fitting; qualitatively determining the relative rate of the curing reaction of the GAP adhesive by a time constant t0 in the equation, wherein the time constant t0 represents that the curing reaction viscosity value reaches 50% to the maximum extent. The method has the advantages that the experiment process is simple, and easy to operate; data are processed quickly, simply and conveniently; the method can be used for determining the relative rate of the curing reaction of the glycidyl azide polymer adhesive.

Description

Technical field [0001] The present invention relates to the technical field of adhesive curing, and more specifically to a method for determining the relative rate of curing reaction of polyglycidyl azide adhesives. Background technique [0002] The journal document "Interfacial reaction mechanism between HTPB / TDI liner and NEPE propellant" ("Solid Rocket Technology", 2010 Vol. 33 No. 1), proposed the use of infrared spectroscopy to determine the surface isocyanate group ( -NCO), calculate the degree of chemical reaction between isocyanate groups and hydroxyl groups at different reaction times, and obtain the reaction speed of different curing reaction systems. [0003] The journal article "Study on the curing reaction kinetics of the active hydrogen components in NEPE propellant" ("Solid Rocket Technology", 2010 Vol. 33, No. 5) proposes the use of chemical titration to determine the hydroxyl-terminated polyether at different temperatures. (PEG) / phenyl isocyanate (PI), bonding age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/16
Inventor 蔡如琳徐胜良杨秋秋吴倩章园园王敏唐根周明川马新刚
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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