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A kind of preparation method of natural melanin-based epoxy resin

A natural melanin-based epoxy resin technology, which is applied in the field of bio-based resin preparation, can solve the problems of epoxy resins that have not yet been seen, and achieve the effects of improving production and working conditions, high efficiency, and mild reaction process

Active Publication Date: 2017-01-04
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The inventor has previously disclosed two methods of using natural melanin as a raw material, using aldehydes as crosslinking agents, and adding or not adding simple phenolic substances to prepare phenol-aldehyde base resins (CN103214643A and CN103232582A), however So far in the prior art, there is no method for preparing epoxy resin with natural melanin as raw material

Method used

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  • A kind of preparation method of natural melanin-based epoxy resin

Examples

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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, take 10g of black sesame seed coat melanin and put it into a reactor with a volume of 1000mL, add 600mL of N,N-dimethylformamide for washing to fully dissolve the melanin, then add 355g of epichlorohydrin, heat up to 90°C, After reacting for 4 hours, cool to room temperature and centrifuge at 5000g for 5 minutes, wash the obtained precipitate with 300mL N,N'-dimethylformamide, and then centrifuge at 5000g for 5 minutes, repeat this process twice, and collect the precipitate That is, natural melanin epoxy resin is obtained.

Embodiment 2

[0030] Such as figure 1 As shown, take 10g of chestnut shell pigment and put it into a reactor with a volume of 1000mL, add 500mL of N,N-dimethylformamide to wash, fully dissolve the melanin, then add 4g of epichlorohydrin, heat up to 85°C, and react for 8 hours After cooling to room temperature and centrifuging at a centrifugal acceleration of 5000g for 5 minutes, the resulting precipitate was washed with 400mL of ethanol and centrifuged at a centrifugal acceleration of 5000g for 5 minutes, and washed twice in this way. Collect the precipitate to obtain the natural melanin epoxy resin.

Embodiment 3

[0032] Such as figure 1 As shown, take 10g of fungus melanin and put it into a reactor with a volume of 1000mL, add 500mL of N,N-dimethylformamide to fully dissolve the melanin, then add 296g of epichlorohydrin, raise the temperature to 85°C, and react for 16 hours. Cool and filter with filter paper, wash the precipitate with 250mL methanol and filter the filter residue, and repeat the washing twice. Collect the filter residue to obtain natural black pigment epoxy resin.

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Abstract

The invention belongs to the technical field of biobased resin preparation methods, and particularly relates to a preparation method of a natural-melanin-base epoxy resin. The method comprises the following steps: putting natural melanin into a reactor, preparing a natural melanin solution with an alkali solvent, adding a mixture of epoxy chloropropane or epoxy chloropropane and a phase-transfer catalyst, carrying out resinification reaction at 20-120 DEG C for 1 hours-7 days, cooling, centrifuging or filtering to separate the natural-melanin-base epoxy resin from the reaction system, and washing the natural-melanin-base epoxy resin to obtain the final product. The prepared epoxy resin has the advantages of wide raw material sources and favorable environmental compatibility; the product is deep brown to black insoluble gel or cake or particles, does not need curing, has fewer residual monomers, and can be directly used after drying or used as a matrix resin of a composite material; and the method has the advantages of simple reaction system, mild and stable reaction process, low consumption, environment friendliness, low production cost and high efficiency, and is beneficial to industrial production.

Description

technical field [0001] The invention belongs to the technical field of bio-based resin preparation methods, and in particular relates to a preparation method of natural melanin-based epoxy resin. Background technique [0002] Materials are the cornerstone of the development of modern industry and the foundation and guide of modern high-tech development. The invention, application and promotion of preparation materials have greatly promoted the progress of human civilization. At present, the preparation resin industry is the preparation material with the highest output, the largest demand, and the widest application. It is the fourth pillar material after metal, cement and wood. Epoxy resin is an important class of thermosetting resins. It is widely used in coatings, adhesives, electronics, etc. because of its good comprehensive mechanical properties, heat resistance, low shrinkage, solvent resistance and chemical corrosion resistance. Electrical materials, building materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/02
Inventor 姚增玉戚建华王瑛
Owner SOUTHWEST FORESTRY UNIVERSITY
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