Modified 2-methylimidazole curing agent and preparation method thereof
A technology of methylimidazole and curing agent, applied in the direction of organic chemistry, etc., can solve problems such as uniform mixing of difficult epoxy resins, increase in viscosity, and performance impact of epoxy resins
Active Publication Date: 2021-05-18
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
However, there are the following problems in the practical application of 2-methylimidazole curing agent: (a) 2-methylimidazole is a solid particle or powder at room temperature, and it is difficult to mix with the viscous powder no matter by increasing the stirring intensity or by improving the fineness of the powder. The thick epoxy resin is mixed evenly, which will lead to uneven curing of the resin and additional internal stress, which is not conducive to performance improvement
(b) The reactivity of 2-methylimidazole itself is relatively high, and the glue made with epoxy resin has a short gel time at room temperature and a short pot life, and the amount of glue at one time should not be too large; at the same time, the high reactivity makes the resin If the viscosity of the system rises too fast, it may cause oligomers to be entrapped in the cured resin, which is not conducive to the improvement of strength
The existence of these problems has caused the performance of the epoxy resin cured by 2-methylimidazole to be affected to a large extent
Method used
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[0014] The present invention will be further described below in conjunction with specific examples, but the present invention is not limited to the following examples.
[0015] I, the preparation of modified 2-methylimidazole curing agent
[0016] The modified 2-methylimidazole curing agents of Examples 1-5 were prepared according to the synthesis formula and process conditions shown in Table 1. Taking Example 2 as an example to illustrate the synthesis process of the corresponding modified 2-methylimidazole curing agent: 1 part of 2-methylimidazole and 2 parts of propylene carbonate are added to the condensing device with reflux In a three-neck flask, reflux and stir at 105°C for 5 hours, and cool to room temperature to obtain a viscous liquid modified 2-methylimidazole curing agent.
[0017] Synthetic formulation and process conditions of table 1 modified 2-methylimidazole curing agent
[0018]
[0019]
[0020] II. Preparation of Modified 2-Methylimidazole Curing Ag...
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The invention discloses a modified 2-methylimidazole curing agent and a preparation method thereof, and belongs to the field of fine chemical engineering. The curing agent is prepared by stirring and reacting 2-methylimidazole and organic carbonic ester according to the mass ratio of 1:1-1:5 at the temperature of 100-150 DEG C for 1.5-6.5 hours. The organic carbonate is one or a mixture of ethylene carbonate and propylene carbonate. The usage amount of the curing agent is 5-20% of the mass of the pure liquid E-44 type epoxy resin, and the curing process condition is that the temperature is kept at 80-160 DEG C for 1-5 hours. The modified 2-methylimidazole curing agent provided by the invention has the advantages of easiness in mixing with epoxy resin and high curing strength, and solves the technical problems that the 2-methylimidazole curing agent is short in working life and cannot be used for preparing more sizing materials at one time; in addition, the technical scheme provided by the invention expands the application of the carbon dioxide chemical fixed product organic carbonate.
Description
technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a modified 2-methylimidazole curing agent and its preparation method and use method. Background technique [0002] 2-Methylimidazole is a five-membered heterocyclic compound containing two nitrogen atoms, in which the nitrogen atom at position 1 is combined with a hydrogen atom to form a secondary amine, and the nitrogen atom at position 3 forms a tertiary amine; When the oxygen resin reacts, the active hydrogen on the nitrogen atom of the secondary amine at position 1 in the 2-methylimidazole molecule undergoes an addition reaction with the epoxy group to convert the secondary amine into a tertiary amine, and then the ring is initiated by the nitrogen atom of the tertiary amine. The oxygen group undergoes anionic polymerization, so 2-methylimidazole belongs to the catalytic polymerization curing agent of epoxy resin. Compared with other imidazole compounds, the price o...
Claims
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IPC IPC(8): C07D233/60C08G59/50
CPCC07D233/60C08G59/5073
Inventor 杨建国徐琰金众徐胜金玲高宏
Owner ANHUI UNIVERSITY OF TECHNOLOGY