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
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[0028] Example 1:
[0029] A method for improving the dyeing rate of wood reactive dyes according to the present invention includes the following steps:
[0030] (1) Preparation of entrainer: take acetone, ethanol and N,N-dimethylhexadecylamine and mix them in a volume ratio of 60:32:8 to obtain a mixed solution of acetone, ethanol and fatty alkyl tertiary amine. Namely entrainer.
[0031] (2) Process the poplar wood heartwood into a 50×20×5mm four-sided light specimen, adjust it to a moisture content of 80%, and put in supercritical CO 2 In the extraction tank. The mixed solution of acetone, ethanol, and N,N-dimethylhexadecylamine is charged into the entrainer tank. The temperature is 35℃, the flow rate is 20L / h CO 2 The fluid is passed into the extraction tank, and the mixed solution in the entrainer tank is passed into the extraction tank with a high-pressure pump at a flow rate of 15 mL / min until the pressure in the extraction tank is 15 MPa, and supercritical CO 2 Fluid extrac...
Example Embodiment
[0039] Example 2:
[0040] A method for improving the dyeing rate of wood reactive dyes according to the present invention includes the following steps:
[0041] (1) Preparation of entrainer: take acetone, ethanol and N,N-dimethyldodecylamine and mix them in a volume ratio of 50:40:10 to obtain a mixed solution of acetone, ethanol and fatty alkyl tertiary amine. Namely entrainer.
[0042] (2) Process the eucalyptus heartwood into a 50×20×5mm four-sided light test piece, adjust it to 100% moisture content, and put in supercritical CO 2 In the extraction tank. Put the mixed solution of acetone, ethanol and N,N-dimethyldodecylamine into the entrainer tank, and pass in CO at a temperature of 45℃ 2 Fluid, until the pressure in the extraction cylinder is 25MPa, supercritical CO 2 Fluid extraction for 60 minutes. After the extraction is completed, the pressure is quickly released at a speed of 10MPa / min, and the temperature is reduced to recover CO 2 , Acetone, ethanol, N,N-dimethylhexad...
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