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Extraction method and application of melia azedarach bark pigment

A neem bark and pigment technology, applied in dyeing, chemical instruments and methods, and resistance to vector-borne diseases, can solve the problems of high cost, difficult to accurately control temperature, and difficult to increase yield, and achieve strong anti-ultraviolet performance , strong fluorescent effect

Active Publication Date: 2021-02-05
JIANGNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, solvothermal extraction and Soxhlet extraction are difficult to increase the yield; and ultrasonic-microwave extraction equipment is expensive and the temperature is difficult to control accurately

Method used

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  • Extraction method and application of melia azedarach bark pigment
  • Extraction method and application of melia azedarach bark pigment
  • Extraction method and application of melia azedarach bark pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A method for extracting neem bark pigment, comprising the following steps:

[0056] 10g 20 order neem bark powder is added in the mixed solvent of 400g water and ethanol (concentration of ethanol is 40%), adopt high-speed wall breaker to mix, extract; Extract pH (add sodium hydroxide solution to adjust) be 11, The extraction temperature is 65°C, and the extraction time is 60 minutes (the blade rotation speed is 42000r / min for 10 minutes, and then the blade rotation speed is reduced to 20500r / min for 50 minutes); Solid-liquid separation; then use rotary evaporation to recover ethanol and concentrate the feed solution (solid content is 4.80%), after concentration, freeze-dry (temperature is -40 ° C, time is 36h), to obtain brown powder, that is, neem bark pigment.

Embodiment 2

[0057] The optimization of embodiment 2 extraction temperature

[0058] Adjust the extraction temperature in Example 1 to be 25, 35, 45, 55, 75°C, and keep the others consistent with Example 1 to obtain the neem bark pigment.

[0059] The neem bark pigment obtained is subjected to a performance test, and the test results are shown in figure 2 ,From figure 2 Can find out: along with the rising of temperature, the crude product yield of neem bark pigment increases gradually, and the crude product yield is the lowest during 25 ℃, is 15.11%, and 65 ℃ (embodiment 1) crude product yield is the highest, is 18.77% . But the yield of crude product of neem bark pigment decreased slightly at 75℃.

Embodiment 3

[0060] The optimization of embodiment 3 solid-liquid ratio

[0061] The solid-liquid ratio (mass ratio of neem bark powder and mixed solvent) in adjusting embodiment 1 is 1: 10, 1: 20, 1: 30, 1: 50, 1: 60, and other is consistent with embodiment 1, Get neem bark pigment.

[0062] The neem bark pigment obtained is subjected to a performance test, and the test results are shown in image 3 ,From image 3 It can be seen that: when the solid-liquid ratio was 1:10, the crude product yield was the lowest, which was 15.51%, and when the solid-liquid ratio was 1:40 (embodiment 1), the crude product yield was the highest, which was 18.77%, and the solid-liquid ratio When the ratio is greater than 1:40, the difference in the yield of the crude product is small, indicating that the yield of the crude product becomes stable from the solid-liquid ratio of 1:40, and the neem bark pigment has been basically dissolved. Comprehensive consideration, the ratio of solid to liquid should be 1:4...

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Abstract

The invention discloses an extraction method and an application of melia azedarach bark pigment, and belongs to the technical field of natural waste utilization and textile dyeing and finishing. The extraction method of the melia azedarach bark pigment comprises the following steps: adding melia azedarach bark powder into a mixed solvent of water and ethanol, uniformly mixing by adopting a high-speed wall breaking machine, and extracting at the rotating speed of a blade of 20000-42000r / min; wherein the extraction pH is 9-11; wherein the extraction temperature is 45-75 DEG C, and the extractiontime is 10-60 minutes; after extraction, centrifuging, carrying out suction filtration, concentrating and drying to obtain the melia azedarach bark pigment. By adopting a high-speed wall-breaking method, the yield of the chinaberry bark pigment crude product can be increased to 18.77%; the melia azedarach bark pigment prepared by the method disclosed by the invention is dark in dyed wool fabric color; compared with an undyed fabric, the mothproof effect is improved, and the weight loss is reduced by 61.5%; the anti-ultraviolet performance is good, the UPF value is increased by 24 times compared with an undyed wool fabric, and fluorescence of different colors can be shown under exciting light of different wavelengths.

Description

technical field [0001] The invention relates to a method for extracting neem bark pigment and its application, and belongs to the technical fields of natural waste utilization and textile dyeing and finishing. Background technique [0002] With the development of society and economy, more and more attention has been paid to the protection of the ecological environment. Wool fabrics, as common textiles in daily life, need to develop more environmentally friendly and eco-friendly processing techniques. However, the dyeing, anti-moth and anti-ultraviolet functional finishing of wool fabrics are still mainly chemical synthetic products. Harmful substances produced in the process of dye synthesis and wastewater after printing and dyeing all damage the ecological environment, and synthetic dyes are not easy to degrade and are carcinogenic. At present, synthetic pyrethrins, naphthalene, p-chlorobiphenyl, etc. are mostly used in the anti-moth finishing of wool fabrics. Although the...

Claims

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Application Information

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IPC IPC(8): C09B61/00D06P1/34
CPCC09B61/00D06P1/34Y02A50/30
Inventor 侯秀良陆晔婷李建红张昊宇彭亚倩徐俊杰李果
Owner JIANGNAN UNIV
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