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Method for preparing chestnut shell vegetable dye through subcritical method and dyeing method of chestnut shell vegetable dye

A technology of vegetable dyes and dyeing methods, applied in the field of preparing chestnut shell vegetable dyes by subcritical method, can solve the problems of many residues and strong seasonality, and achieve the effects of safe extraction process, improved shelf life and good light resistance.

Pending Publication Date: 2021-10-08
苏州麻朵纺织科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The thorn buds on the outside of chestnuts contain more tannins, which can be used for plant dyeing, but they are usually extracted in time during the harvest season, with strong seasonality and more residues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1, the method that subcritical method prepares chestnut shell vegetable dye:

[0026] Select clean chestnut shells that are not moldy and peeled by a mechanical peeling machine, add chestnut shells and purified water to subcritical stainless steel equipment, the weight ratio of chestnut shells to purified water is 1:6, and add high temperature alkali to the subcritical stainless steel equipment The high-temperature alkaline buffer AH added accounts for 1% of the total weight of pure water. Then it is heated to a subcritical extraction temperature of 125° C., and the extraction time is 35 minutes. After extraction, the temperature is lowered to below 60° C., and the material is filtered out.

[0027] After the extraction is completed, the extracted chestnut shell is taken out and dried naturally, which can be used for preparing biofuel or activated carbon. Add natural dyeing auxiliaries FA to the extract in an amount of 6% (relative to the total weight of the chestnut s...

Embodiment 2

[0033] 1. Method for preparing chestnut shell vegetable dye by subcritical method:

[0034] Select clean chestnut shells that are not moldy and peeled by a mechanical peeling machine, add chestnut shells and purified water to subcritical stainless steel equipment, the weight ratio of chestnut shells to purified water is 1:10, and add high temperature alkali to the subcritical stainless steel equipment The high-temperature alkaline buffer AH added is 2% of the total weight of pure water. Then it is heated to a subcritical extraction temperature of 120° C., and the extraction time is 50 minutes. After extraction, the temperature is lowered to below 60° C., and the material is filtered out.

[0035] After the extraction is completed, the extracted chestnut shell is taken out and dried naturally, which can be used for preparing biofuel or activated carbon. Add natural dyeing auxiliaries FA to the extract in an amount of 4% (relative to the total weight of the chestnut shell subcr...

Embodiment 3

[0040] 1. Method for preparing chestnut shell vegetable dye by subcritical method:

[0041] Select clean chestnut shells that are not moldy and peeled by a mechanical peeling machine, add chestnut shells and purified water to subcritical stainless steel equipment, the weight ratio of chestnut shells to purified water is 1:6, and add high temperature alkali to the subcritical stainless steel equipment The high-temperature alkaline buffer AH added is 4% of the total weight of pure water. Then it is heated until the subcritical extraction temperature is 130° C., and the extraction time is 20 minutes. After extraction, the temperature is lowered to below 60° C., and the material is filtered out.

[0042] After the extraction is completed, the extracted chestnut shell is taken out and dried naturally, which can be used for preparing biofuel or activated carbon. Add natural dyeing auxiliary FA to the extract, and the consumption is 8% (relative to the total weight of chestnut shell...

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Abstract

The invention relates to a method for preparing chestnut shell vegetable dye through a subcritical method and a dyeing method thereof, the preparation method comprises the following steps: 1) adding chestnut shells and purified water into subcritical stainless steel equipment, adding a high-temperature alkaline buffer agent AH into the subcritical stainless steel equipment, then heating to subcritical temperature, extracting chestnut shell natural pigment, filtering and discharging; and 2) adding a natural dyeing auxiliary agent FA into the extracting solution obtained after filtration in the step 1) to prepare the chestnut shell vegetable dye. The chestnut shell vegetable dye prepared by adopting a subcritical method is subjected to a one-bath low-temperature sectional dyeing method, so that higher dye-uptake and color fastness can be obtained, agricultural and forestry waste resources can be recycled, the environment is improved, and textiles dyed by plants are safer and more environment-friendly.

Description

technical field [0001] The invention relates to the field of research and development and production of natural plant dyes, in particular to a subcritical method for preparing chestnut shell vegetable dyes and a dyeing method thereof. Background technique [0002] Chestnut originated in China and is distributed in as many as 26 provinces in our country. Chestnut is rich in starch, sugar and various vitamins. Chestnuts in the south do not peel for three days, and the kernels turn black and rot. Factories mostly use chestnut inner skin peeling machines, which can peel off the shells of raw or cooked chestnuts. [0003] The thorn buds on the outside of chestnuts contain more tannins, which can be used for plant dyeing, but they are usually extracted in time during the harvest season, which has strong seasonality and produces more residues. The present invention does not use the thorn buds of the outer layer of chestnut shells, and directly adopts a chestnut shell peeling mach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00C09B67/54D06P1/34
CPCC09B67/0096C09B61/00D06P1/34
Inventor 祝洪哲
Owner 苏州麻朵纺织科技有限公司
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