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Completely bio-based epoxy resin composite material and preparation method thereof

A technology based on epoxy resin and composite materials, which is applied in the field of complete bio-based epoxy resin composite materials and its preparation, can solve the problems of complex chemical grafting methods, performance degradation, and high cost of bio-based materials, and achieve structure and performance Controllable, easy industrial production, excellent mechanical properties

Active Publication Date: 2019-09-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although the research on the modification of simple epoxy resin systems by starch has been carried out, it is still in its infancy. There are problems of starch dispersion and compatibility, and the filling ratio is also maintained at a low level. For example, patent CN102516714A, using starch Nanocrystals toughen and modify epoxy resin, but the filling ratio with the best effect only increases the elongation at break by 33% compared with the original resin, and the performance begins to decline when the filling ratio is greater than 5%.
The paper RSC Adv., 2015, 5, 64456-64465 uses the grafting reaction of epoxy resin and starch to prepare starch-based epoxy resin. The performance of the obtained resin is better, but the chemical grafting method is more complicated, and due to the problem of grafting efficiency , the starch filling ratio is not high, only 20%
These bio-based epoxy resin composite materials have certain mechanical properties, but the high cost of some bio-based materials limits their promotion and application, and due to the single component, the performance is not easy to control, adding other components to compound can Adjust its structure and performance in a simple way, making it more suitable for industrial applications

Method used

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  • Completely bio-based epoxy resin composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 100g of cornstarch and disperse it in 200g of ethanol / water solution (the volume ratio of ethanol to water is 7:3), add 10ml of concentrated hydrochloric acid dropwise during stirring, raise the temperature to 55°C, stop the reaction after 24 hours of reaction, and oxidize with hydrogen Sodium aqueous solution adjusts pH=7, filters, washes, and dries to obtain activated starch.

[0027] Weigh 100g of active starch, add 200g of ethanol / water solution (the volume ratio of ethanol to water is 7:3), stir and disperse evenly, add sodium hydroxide to adjust pH=9 (adjusting pH here is to prepare modified starch Sodium hydroxide was introduced into the system as a catalyst), the temperature was raised to 60°C, 10g of pyridine and 15g of epichlorohydrin were added, and the reaction was continued for 2h to stop the reaction. The obtained product is washed with water and alcohol to remove impurities and by-products, and dried at low temperature to obtain epoxy-modified starc...

Embodiment 2

[0030] Weigh 100g of cornstarch and disperse it in 200g of ethanol solution with a volume fraction of 70%, add 10ml of concentrated hydrochloric acid dropwise during stirring, heat up to 55°C, stop the reaction after 24 hours of reaction, adjust pH=7 with aqueous sodium hydroxide solution, Filter, wash and dry to obtain active starch.

[0031] Weigh 100g of activated starch, add it to 200g of ethyl acetate solution, stir and disperse evenly, raise the temperature to 60°C, add 10g of pyridine and 15g of epichlorohydrin, react for 30 minutes and add 10g of pyridine, continue the reaction for 2h to stop the reaction. The obtained product is washed with water and alcohol to remove impurities and by-products, and dried at low temperature to obtain epoxy-modified starch.

[0032] The prepared epoxy-modified starch was tested for epoxy value by the hydrochloric acid-acetone method, and the measured epoxy value was 0.091mol / 100g.

Embodiment 3

[0034] Take by weighing 100g potato starch, be dispersed in 200g volume fraction and be 70% ethanol solution, dropwise add 10ml concentrated hydrochloric acid in the stirring process, be warming up to 55 ℃, stop reaction after reacting for 24 hours, adjust pH=7 with aqueous sodium hydroxide solution, Filter, wash and dry to obtain active starch.

[0035] Weigh 100g of activated starch, add it to 200g of ethyl acetate solution, stir and disperse evenly, raise the temperature to 60°C, add 5g of pyridine and 15g of epichlorohydrin, and continue the reaction for 2h to stop the reaction. The obtained product is washed with water and alcohol to remove impurities and by-products, and dried at low temperature to obtain epoxy-modified starch.

[0036] The prepared epoxy-modified starch was tested for epoxy value by the hydrochloric acid-acetone method, and the epoxy value was measured to be 0.060 mol / 100g.

[0037] 2. Preparation of composite materials

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Abstract

The invention discloses a completely bio-based epoxy resin composite material and a preparation method thereof. The composite material is prepared by pouring molding of bio-based starch, bio-based epoxy resin and a bio-based curing agent. Based on 100 parts by weight of the bio-based epoxy resin, the bio-based degradable starch is 1-120 parts by weight, and the curing agent is 20-300 parts by weight. The composite material of the invention is completely bio-based, has excellent mechanical properties, is low-cost, has controllable structure and performance, is a green environmental protection material, is environmentally friendly, and is easy to realize industrial production.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a complete bio-based source epoxy resin composite material and a preparation method thereof. Background technique [0002] Due to the advantages of low curing shrinkage, strong adhesion, high mechanical properties of cured products, good chemical resistance, and good electrical insulation properties, epoxy resin has an irreplaceable position in fiber-reinforced resin-based composite materials. Used in aerospace, aviation, automobile, construction and other fields. However, traditional epoxy resin is highly dependent on petroleum resources, and the production process will pollute the environment and is difficult to degrade. Extensive use and disposal has become one of the sources of white pollution, and has become a concern of the whole society. How to solve the problem of white pollution is a major topic worth studying. Vigorously developing degradable pla...

Claims

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Application Information

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IPC IPC(8): C08L91/00C08L3/04C08L63/00C08L77/06C08B31/00
CPCC08B31/00C08L63/00C08L91/00C08L2201/06C08L2205/03C08L3/04C08L77/06
Inventor 东为富李婷汪洋郑毛荣张洪吉施冬健陈明清
Owner JIANGNAN UNIV