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Normal-temperature curing sulfydryl-imidazole curing agent as well as preparation method and application thereof

An imidazole curing agent and room temperature curing technology, applied in the field of polymer composite materials, can solve the problems of not being able to meet outdoor room temperature curing, poor heat resistance, poor weather resistance, etc.

Pending Publication Date: 2021-06-08
广西珀源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyamine ionic liquids generally have a slow curing rate and need to be cured in a heating stage, which cannot meet the needs of outdoor room temperature curing.
The commonly used mercapto-based curing agents have fast curing speed and good bonding performance, and are often used in outdoor activities. However, mercapto-based curing agents have disadvantages such as poor heat resistance and poor weather resistance. Therefore, based on this, a room temperature curing agent has been developed. The room temperature curing agent with fast curing speed and good heat resistance is an urgent demand at present.

Method used

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  • Normal-temperature curing sulfydryl-imidazole curing agent as well as preparation method and application thereof
  • Normal-temperature curing sulfydryl-imidazole curing agent as well as preparation method and application thereof
  • Normal-temperature curing sulfydryl-imidazole curing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A kind of normal temperature curing mercapto-imidazole curing agent, the molecular structure is as shown in formula I:

[0051]

[0052] The R 1 Is imidazolyl;

[0053] The preparation method of the mercapto-imidazole curing agent is as follows: dissolve the mercapto curing agent in methanol, condense and reflux at 50°C for 1 hour, then add the imidazole curing agent dissolved in benzyl alcohol, and magnetically stir at 50°C to condense and reflux for 6 hours , after the reaction is cooled to room temperature, the solvent is removed to obtain the mercapto-imidazole curing agent;

[0054] The mercapto curing agent is pentaerythritol tetra-3-mercaptopropionate (CAS No.: 7575-23-7);

[0055] The imidazole curing agent is imidazole;

[0056] The methanol: mercapto curing agent = 1 mL: 100 μg; benzyl alcohol: imidazole curing agent = 1 mL: 100 μg.

[0057] Four kinds of mercapto-imidazole curing agents were prepared by using the molar ratios of mercapto curing agent a...

Embodiment 2

[0059] A kind of normal temperature curing mercapto-imidazole curing agent, the molecular structure is as shown in formula I:

[0060]

[0061] The R 1 is 4-methylimidazolyl;

[0062] The preparation method of the mercapto-imidazole curing agent is as follows: dissolve the mercapto curing agent in methanol, condense and reflux at 50°C for 1 hour, then add the imidazole curing agent dissolved in benzyl alcohol, and magnetically stir at 50°C to condense and reflux for 6 hours , after the reaction is cooled to room temperature, the solvent is removed to obtain the mercapto-imidazole curing agent;

[0063] The mercapto curing agent is pentaerythritol tetra-3-mercaptopropionate (CAS No.: 7575-23-7);

[0064] The imidazole curing agent is 4-methylimidazole;

[0065] The methanol: mercapto curing agent = 1 mL: 100 μg; benzyl alcohol: imidazole curing agent = 1 mL: 100 μg.

[0066] Four kinds of mercapto-imidazole curing agents were prepared by using the molar ratios of mercapt...

Embodiment 3

[0068] A kind of normal temperature curing mercapto-imidazole curing agent, the molecular structure is as shown in formula I:

[0069]

[0070] The R 1 Is 1-methylimidazolyl;

[0071] The preparation method of the mercapto-imidazole curing agent is as follows: dissolve the mercapto curing agent in methanol, condense and reflux at 50°C for 1 hour, then add the imidazole curing agent dissolved in benzyl alcohol, and magnetically stir at 50°C to condense and reflux for 6 hours , after the reaction is cooled to room temperature, the solvent is removed to obtain the mercapto-imidazole curing agent;

[0072] The mercapto curing agent is pentaerythritol tetra-3-mercaptopropionate (CAS No.: 7575-23-7);

[0073] The imidazole curing agent is 1-methylimidazole;

[0074] The methanol: mercapto curing agent = 1 mL: 100 μg; benzyl alcohol: imidazole curing agent = 1 mL: 100 μg.

[0075] Four kinds of mercapto-imidazole curing agents were prepared by using the molar ratios of mercapt...

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Abstract

The invention belongs to the field of polymer composite materials, and particularly relates to a normal-temperature prepolymerization and high-temperature curing latent mercaptan curing agent structure, a method for preparing the curing agent structure and application of the curing agent in preparation of an epoxy resin composite material. The sulfydryl-imidazole curing agent in hte molecular structure as shown in the formla I, II or III disclosed by the invention can be used for carrying out curing reaction on epoxy resin at normal temperature, so that the glass-transition temperature of the epoxy resin is obviously increased, and the heat resistance of the epoxy resin is improved.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a structure of a latent mercaptan curing agent prepolymerized at room temperature at high temperature, a method for preparing the curing agent structure, and an application of the curing agent in preparing epoxy resin composite materials. Background technique [0002] Epoxy resin composite materials are widely used in various fields due to their advantages of easy processing, insulation, easy molding, and good fluidity. During the curing process of epoxy resin, prepolymerization reaction is usually required to reduce its cohesive energy and microcracks. However, during the curing process of epoxy resin composite materials, the initial reaction rate of anhydride and amine curing agent is slow, and heating is usually required. Prepolymerization increases its production cost and processing technology. Therefore, it is one of the research hotspots to modify the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C08G59/56C08G59/66
CPCC08G59/5073C08G59/56C08G59/66
Inventor 罗海强吴世妏罗影春陈韬苏光临
Owner 广西珀源新材料有限公司
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