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Method for improving degree of exhaustion during wood dyeing

A technology of dyeing rate and wood, which is applied in the field of wood dyeing, can solve the problems of inability to remove acidic substances, unsatisfactory pretreatment effect, and inability to greatly improve supercritical polarity, so as to achieve the effect of increasing polarity and increasing solubility

Inactive Publication Date: 2016-06-08
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, Xiao Zhongping introduced the use of supercritical CO 2 Fluid pretreats fir, masson pine, sassafras and other wood, but the entrainer of benzene-ethanol mixed solvent can not greatly improve the supercritical CO 2 Polarity, while the whole system is acidic, cannot remove the acidic substances in the extract, making the pretreatment effect unsatisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for improving the dyeing uptake rate of wood reactive dyes of the present invention comprises the following steps:

[0030] (1) Preparation of entrainer: Take acetone, ethanol and N,N-dimethylhexadecylamine, and mix them according to the volume ratio of 60:32:8 to obtain a mixed solution of acetone, ethanol and fatty alkyl tertiary amine, That is entrainer.

[0031] (2) Process the poplar heartwood into a 50×20×5mm four-sided light test piece, adjust it to a moisture content of 80%, and put it in supercritical CO 2 in the extraction cylinder. Put the mixed solution of acetone, ethanol, and N,N-dimethylhexadecylamine into the entrainer tank. CO with a temperature of 35°C and a flow rate of 20L / h 2 The fluid is passed into the extraction cylinder, and at the same time, the mixed solution in the entrainer tank is passed into the extraction cylinder at a flow rate of 15mL / min with a high-pressure pump, until the pressure in the extraction cylinder is 15MPa, and ...

Embodiment 2

[0040] A method for improving the dyeing uptake rate of wood reactive dyes of the present invention comprises the following steps:

[0041] (1) Preparation of entrainer: take acetone, ethanol and N,N-dimethyldodecylamine, and mix them according to the volume ratio of 50:40:10 to obtain a mixed solution of acetone, ethanol and fatty alkyl tertiary amine, That is entrainer.

[0042] (2) Process the eucalyptus heartwood into a 50×20×5mm four-sided light test piece, adjust the moisture content to 100%, and put in supercritical CO 2 in the extraction cylinder. Put a mixed solution of acetone, ethanol, and N,N-dimethyldodecylamine into the entrainer tank, and pass through CO at a temperature of 45°C. 2 Fluid, until the pressure in the extraction cylinder is 25MPa, carry out supercritical CO 2 Fluid extraction for 60min. After the extraction is completed, the pressure is quickly released at a rate of 10MPa / min, and the temperature is lowered to recover CO 2 , acetone, ethanol, N...

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Abstract

The invention discloses a method for improving the degree of exhaustion during wood dyeing and belongs to the technical field of wood dyeing. The method specifically comprises the following steps: adjusting the moisture content of wood to be 50-100%, carrying out supercritical CO2 fluid extraction by adopting a mixed solution containing acetone, ethanol and one or more fatty alkyl tertiary amines as an entrainer, and then carrying out pressure relief at a rate of 1.0-10.0 MPa / min to obtain pretreated wood; soaking the pretreated wood in a mixed solution containing one or more active dye liquids and sodium sulfate to obtain dyed wood; and conducting fixation and soaping on the dyed wood. The method is simple in process, and has the advantages that not only can the degrees of exhaustion and fixation of an active dye in wood be improved, but also the dyeing depth can be improved.

Description

technical field [0001] The invention relates to the technical field of wood dyeing, in particular to a method for improving the dyeing rate of wood dyeing. Background technique [0002] The dyeing of wood reactive dyes is the process of wetting, diffusing, absorbing and dyeing solutions on the wood surface and the dyeing solution penetrates into the wood and coloring, in which the movement and penetration of reactive dye molecules in the wood is very important, especially for the deep staining of solid wood. important. Due to the large size of wood and thick dyeing depth, the permeability of reactive dyes in wood has become an important factor affecting dyeing. The better the permeability, the higher the dyeing rate. The main pathway for the reactive dye solution to penetrate from the wood end to the interior of the wood is the cell wall capillary system (large capillary and micro capillary) and the pit system in the wood. The content and distribution of extracts in the ce...

Claims

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Application Information

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IPC IPC(8): B27K5/02B27K5/00B27K3/50
CPCB27K3/50B27K5/008B27K5/02
Inventor 喻胜飞刘元李贤军罗武生胡嘉裕
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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