A method for extracting tannin extract from chestnut bracts and preparing composite materials

A technology of composite materials and chestnut bracts, applied in the direction of chemical instruments and methods, natural resin technology, etc., can solve the problems of less application research of downstream products, low content of extract tannin, low production efficiency, etc., and achieve extract tannin The effect of high content, good social benefits and high production efficiency

Active Publication Date: 2020-03-24
GUANGXI FORESTRY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing method has defects such as relatively complicated process, high cost, and low production efficiency, and the produced extract has low tannin content and darker color
At present, the research mainly focuses on the extraction and purification of active ingredients in chestnut bracts, but there are few studies on the application of its downstream products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for extracting tannin extract from chestnut bracts, comprising the following steps:

[0034] (1) After the chestnut buds are dried in the sun, sort and remove iron and impurities, and crush the particles to 1.0mm for later use;

[0035] (2) Take the crushed above and put it into the extraction tank, add water, sodium bisulfite and ethanol, the ratio of solid to liquid is 1:3, raise the temperature to 60°C, extract for 2 hours, collect the extraction solution and chestnut bract particles respectively , chestnut bract granules were repeatedly extracted 3 times, and the extracts were combined; wherein the sodium bisulfite addition was 1.5% of the water, and the ethanol addition was 3% of the water;

[0036] (3) Cool the above extract to 2°C, let it stand for 12 hours, filter, and remove the precipitate;

[0037] (4) Evaporate under reduced pressure at a pressure of -0.09Mpa and temperature controlled at 65°C to the concentration of the concentrated solution to 20...

Embodiment 2

[0043] A method for extracting tannin extract from chestnut bracts, comprising the following steps:

[0044] (1) After the chestnut buds are dried in the sun, sort and remove iron and impurities, and crush the particles to 2.0mm for later use;

[0045] (2) Take the crushed above and put it into the extraction tank, add water, sodium bisulfite and ethanol, the ratio of solid to liquid is 1:3, raise the temperature to 40°C, extract for 5 hours, collect the extraction solution and chestnut bract particles respectively , Chestnut bract granules were repeatedly extracted 3 times, and the extracts were combined; wherein the sodium bisulfite addition was 1% of the water, and the ethanol addition was 5% of the water;

[0046] (3) Cool the above extract to 2°C, let it stand for 12 hours, filter, and remove the precipitate;

[0047] (4) Evaporate under reduced pressure at a pressure of -0.09Mpa and temperature controlled at 70°C from the above impurity-removed extract until the concent...

Embodiment 3

[0053] A method for extracting tannin extract from chestnut bracts, comprising the following steps:

[0054] (1) After the chestnut buds are dried in the sun, sort and remove iron and impurities, and crush the particles to 4.0mm for later use;

[0055] (2) Take the crushed above and put it into the extraction tank, add water, sodium bisulfite and ethanol, the ratio of solid to liquid is 1:3, raise the temperature to 80°C, extract for 2 hours, collect the extraction solution and chestnut bract particles respectively , Chestnut bract granules were repeatedly extracted 3 times, and the extracts were combined; wherein the sodium bisulfite addition was 2% of the water, and the ethanol addition was 1% of the water;

[0056] (3) Cool the above extract to 10°C, let it stand for 24 hours, filter, and remove the precipitate;

[0057] (4) Evaporate under reduced pressure at a pressure of -0.1Mpa and temperature controlled at 60°C from the above impurity-removed extract until the concent...

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Abstract

The invention discloses a method for extracting tannin extract and preparing composite materials by using chestnut bracts. The chestnut bracts are broken, and water, sodium bisulfite and ethanol are added for leaching. Dilute sulfuric acid and calcium carbonate are adsorbed to remove impurities, filtered, and the filtrate is concentrated and spray-dried to obtain the tannin extract product. Epoxy resin foam can be prepared by reacting the concentrated liquid extracted from chestnut buds with epoxy resin, and the remaining chestnut buds after extraction can be used together with epoxy resin to prepare high-strength, low-density composite materials. The present invention can not only comprehensively utilize chestnut bracts and turn waste into treasure, but also has the advantages of simple process, low cost, high production efficiency, high content of tannin and light color in the produced extract, and has good social and ecological benefits. benefits and economic benefits.

Description

technical field [0001] The invention relates to the technical field of extraction and utilization of natural plant active ingredients, in particular to a method for extracting tannin extract from chestnut bracts and preparing composite materials. Background technique [0002] Chestnut ( Castanea mollissima Blume ) is an economic plant of the Fagaceae Chestnut genus, mainly distributed in the temperate and subtropical regions of the northern hemisphere. Chestnut has been planted in my country for more than 3,000 years, and it is distributed in most areas, with concentrated cultivation in North China and the Yangtze River Basin. With the development of society, the guidance of policies and the stimulation of market demand for chestnut products, the cultivation area and output of chestnut in my country have increased rapidly in recent years. In 2007, the output reached 925,000 tons, accounting for 75.61% of the total output of chestnut in the world. growing steadily. Along wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09F1/00C08L63/00C08L93/00C08L97/02
CPCC08L63/00C08L2203/14C08L2205/03C08L2205/16C09F1/00C08L93/00C08L97/02
Inventor 孟中磊周丽珠李军集谷瑶秦荣秀
Owner GUANGXI FORESTRY RES INST
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