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A kind of dendritic epoxy resin and preparation method thereof

An epoxy resin and dendritic technology, applied in the field of dendritic epoxy resin and its preparation, to achieve the effects of reducing molecular regularity, expanding movement space, and improving toughness and impact strength

Active Publication Date: 2020-04-28
ANHUI SHANFU NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is simple to operate and easy to implement, and overcomes the defect of difficult implementation in the prior art

Method used

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  • A kind of dendritic epoxy resin and preparation method thereof
  • A kind of dendritic epoxy resin and preparation method thereof
  • A kind of dendritic epoxy resin and preparation method thereof

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preparation example Construction

[0025] The invention provides a kind of preparation method of dendritic epoxy resin, comprises the following steps:

[0026] Mix the epoxy resin raw material, the grafted side chain compound and the catalyst, and carry out grafting reaction to obtain dendritic epoxy resin;

[0027] The grafted side chain compound is straight chain carboxylate and / or straight chain isocyanate.

[0028] In the present invention, the mass ratio of epoxy resin raw material, graft side chain compound and catalyst is preferably (90~110):(27~30):(0.1~0.5), more preferably (95~100):( 28-30): (0.2-0.3); the present invention has no special requirements on the sources of the raw materials, and commercially available products whose sources are well known to those skilled in the art can be used.

[0029] In the present invention, the epoxy resin raw material contains a hydroxyl group, and the active hydroxyl group is used to graft the grafted side chain compound into the molecular structure of the epoxy ...

Embodiment 1

[0046] Add 100g of E-20 epoxy resin into a 250ml three-necked flask, pass nitrogen gas into the three-necked flask, remove the air and then seal it; heat the epoxy resin raw material to 80°C by means of oil bath heating, and stir, and wait for the epoxy resin to Add 28g of methyl n-heptanoate after melting the resin raw material, stir evenly, add 0.3g of butyl phthalate, continue to heat up to 90°C, vacuumize, and react at a stirring speed of 500r / min for 2 hours to obtain a dendritic epoxy resin.

Embodiment 2

[0048] Add 90g of E-20 epoxy resin into a 250ml three-necked flask, pass nitrogen gas into the three-necked flask, remove the air and then seal it; heat the epoxy resin raw material to 90°C by means of oil bath heating, and stir, and wait for the epoxy resin to Add 27g of methyl 5-phenylvalerate after melting the resin raw material, stir evenly, add 0.2g of dibutyltin oxide, continue to heat up to 100°C, vacuumize, and react at a stirring speed of 600r / min for 3 hours That is, a dendritic epoxy resin is obtained.

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Abstract

The invention provides a preparation method of dendritic epoxy resin, and belongs to the technical field of epoxy resins. The preparation method comprises the following steps: mixing an epoxy resin raw material, linear carboxylate and / or linear isocyanate and a catalyst, and carrying out a grafting reaction to obtain the dendritic epoxy resin. The molecular structure of the epoxy resin is graftedwith a graft side chain compound under the action of a chain extension catalyst by fully using active hydroxyl groups to make the whole epoxy resin have a dendritic structure, reduce the molecular regularity of the epoxy resin and expand the movement space of the molecular chain, thereby so the toughness and the impact strength of the epoxy resin are improved.

Description

technical field [0001] The invention relates to the technical field of epoxy resins, in particular to a dendritic epoxy resin and a preparation method thereof. Background technique [0002] Epoxy resin is an organic polymer compound containing two or more epoxy groups. Except for a few epoxy resins, the molecular weight of epoxy resin is generally small, and it needs to be used in conjunction with a curing agent to form a cured epoxy resin. . [0003] Cured epoxy resin has many excellent properties: good mechanical properties, corrosion resistance, electrical insulation properties. In addition, the cured epoxy resin also has the advantages of controllable crosslinking density, no small molecules produced during the curing process, and low shrinkage, making it widely used in the automotive, aviation, machinery, chemical, electronic and electrical industries. But at the same time, epoxy resin also has disadvantages such as large internal stress after curing, brittleness, imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/16C08G18/58C08G18/71C09D163/00C09D175/04C09D5/03C09D7/61C09D7/63C09D7/65
CPCC08G18/58C08G18/71C08G59/1455C09D5/031C09D5/033C09D163/00C09D175/04C08L91/06C08K5/07C08K3/04C08K3/00
Inventor 任华包秀群叶琳
Owner ANHUI SHANFU NEW MATERIAL TECH