A method for determining the relative rate of curing reaction of polyazide glycidyl ether adhesive

A glycidyl ether and curing reaction technology is applied in the field of determining the relative rate of the curing reaction of polyazide glycidyl ether adhesives, which can solve problems such as interference and undetectable heat, and achieve easy operation, fast and simple data processing, and chemical saving. Effects of Reagents

Active Publication Date: 2021-09-03
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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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.

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  • A method for determining the relative rate of curing reaction of polyazide glycidyl ether adhesive
  • A method for determining the relative rate of curing reaction of polyazide glycidyl ether adhesive
  • A method for determining the relative rate of curing reaction of polyazide glycidyl ether adhesive

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with embodiment.

[0031] (1) Weigh 20g of GAP adhesives with 3 different hydroxyl values, place them in three beakers respectively, add 0.06g catalyst triphenyl bismuth, stir evenly, and the ratio of substances according to the isocyanate group and hydroxyl group is 1 Add 1.16g, 0.73g, and 0.42g of toluene diisocyanate accurately to form three curing reaction systems GAP-TDI-1, GAP-TDI-2 and GAP-TDI-3, and continue stirring to mix the curing reaction systems Uniform, immediately put into 50 ℃ oil bath oven for curing reaction.

[0032] (2) At different time points in the curing reaction process, a small amount of samples of the curing system GAP-TDI-1 were taken out of the oven, and the viscosity value of the sample was tested immediately with a rheometer, while the other two systems continued to cure in the oven. The above tests were also carried out for the curing system GAP-TDI-2 and the curing sy...

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Abstract

The invention provides a method for judging the relative rate of curing reaction of polyazide glycidyl ether (GAP) adhesive, the method first adopts rheological method to test the viscosity values ​​of GAP adhesive and curing agent at different time points of curing reaction, According to the Boltzmann equation, the curve of viscosity changing with time and each parameter in the equation are obtained by fitting, and the time constant t that the viscosity value of the curing reaction reaches 50% of the maximum viscosity value is expressed in the equation. 0 To qualitatively determine the relative speed of the curing reaction of the GAP adhesive. The method is simple in experimental process, easy to operate, fast and convenient in data processing, and can be used to determine the relative rate of curing reaction of polyazide glycidyl ether adhesives.

Description

technical field [0001] The invention relates to the technical field of adhesive curing, in particular to a method for determining the relative rate of curing reaction of a polyazide glycidyl ether adhesive. Background technique [0002] The journal document "Interfacial Reaction Mechanism of HTPB / TDI Lining and NEPE Propellant" ("Solid Rocket Technology", Volume 33, No. 1, 2010) proposed the use of infrared spectroscopy to determine the isocyanate groups on the surface of the lining with different reaction times ( -NCO), calculate the degree of chemical reaction between the isocyanate group and the hydroxyl group at different reaction times, and obtain the reaction speed of different curing reaction systems. [0003] The journal document "Study on the Curing Reaction Kinetics of Active Hydrogen Components in NEPE Propellants" ("Solid Rocket Technology", Volume 33, Issue 5, 2010) proposes the use of chemical titration to determine the corresponding hydroxyl-terminated polyeth...

Claims

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Application Information

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Patent Type & AuthorityPatents(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
OwnerHUBEI INST OF AEROSPACE CHEMOTECHNOLOGY