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A kind of latent curing agent with flame retardancy and preparation method thereof

A technology of latent curing agent and flame retardancy, which is applied in the field of curing agent and its preparation, can solve the problem of no report on curing agent, achieve good latent property, good adhesion, and reduce the effect of curing temperature

Active Publication Date: 2016-02-24
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the research on latent curing agent and flame retardant curing agent is carried out separately, and there is no domestic report on the curing agent with these two properties at the same time.

Method used

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  • A kind of latent curing agent with flame retardancy and preparation method thereof
  • A kind of latent curing agent with flame retardancy and preparation method thereof
  • A kind of latent curing agent with flame retardancy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Preparation of powder DOPO:

[0036] Dissolve 21.6g of DOPO in 45ml of ethanol, heat and stir at 60°C to dissolve, pour it into 0°C water in an ice bath while hot, stir for 10min, filter and dry to obtain powdered DOPO.

[0037] 2. Preparation of modified dicyandiamide:

[0038] Control the temperature of the oil bath at 60°C, add 0.1mol (8.40g) of dicyandiamide and 100ml of water into a 150ml three-necked flask, stir to dissolve the dicyandiamide, add the powder DOPO prepared in step 1, stir to make the system uniform, and heat up to 120°C, after 3 hours of reflux reaction, add 10ml of 1mol / L dicyandiamide aqueous solution (containing 0.84g of dicyandiamide), and after 0.5h of reaction, add 1mol / L dicyandiamide aqueous solution of 10ml (containing dicyandiamide 0.84g), continued to react for 0.5h, poured out the reaction solution while it was hot, placed it in an ice bath and stirred rapidly, filtered and dried to obtain a white powdery curing agent.

[0039] 3. P...

Embodiment 2

[0044] Embodiment 2: the preparation of dicyandiamide / epoxy resin

[0045] Grind dicyandiamide through a 400-mesh sieve, mix dicyandiamide and epoxy resin evenly at a mass ratio of 8.4:100, place in an oven at 140°C for 8 hours, cool, and the premix is ​​still in a viscous liquid state, namely Not well cured, the temperature is too low. During the curing process, the curing agent will precipitate, and continue to cure after stirring with a toothpick.

Embodiment 3

[0046] Embodiment 3: the preparation of dicyandiamide / epoxy resin

[0047] Grind dicyandiamide through a 400-mesh sieve, mix dicyandiamide and epoxy resin evenly at a mass ratio of 8.4:100, place in an oven at 160°C for 8 hours, cool, and the premix is ​​still in a viscous liquid state, namely Not well cured, the temperature is too low. During the curing process, the curing agent will precipitate, and continue to cure after stirring with a toothpick.

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Abstract

The invention discloses a latent curing agent with fire resistance and a preparation method thereof. The structural formula of the latent curing agent with fire resistance is shown in the specification. The dicyandiamide is modified by DOPO, so that the compatibility of the curing agent and the epoxy resin can be improved. By adopting the curing agent disclosed by the invention, good flame retardant property is provided for epoxy resin when good flame retardancy is ensured, the limit oxygen index of a cured product is 25.3, and the latent curing agent belongs to a nonflammable material.

Description

1. Technical field [0001] The invention relates to a curing agent and a preparation method thereof, in particular to a flame-retardant latent curing agent and a preparation method thereof, which are used in a one-component epoxy resin system. 2. Background technology [0002] Epoxy resin has good mechanical properties, adhesive properties, electrical insulation, chemical stability and processability, and is widely used in construction, machinery, electronic appliances, aerospace and other fields. Epoxy resin needs to be added with a curing agent when it is used, and it needs to be cured and cross-linked under certain conditions to form a three-dimensional network structure, so that it can show various excellent properties and realize its value. Therefore, in the application and development of epoxy resin, curing agent plays a pivotal role. The traditional epoxy resin curing agent is a two-component curing agent. This type of curing agent can quickly react with epoxy resin a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/50C07F9/6574
Inventor 史铁钧王权虞伕刘建华
Owner HEFEI UNIV OF TECH