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A method for regulating the generation of oxidized cellulose in the process of oxidative degumming of ramie

A technology of oxidative cellulose and oxidative degumming, which is applied in the direction of chemical production of bast fibers, etc., to achieve the effect of optimal control, quality assurance, and improvement of degumming efficiency.

Inactive Publication Date: 2017-08-01
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are relatively few reports in relevant literature and patents on this aspect.

Method used

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  • A method for regulating the generation of oxidized cellulose in the process of oxidative degumming of ramie
  • A method for regulating the generation of oxidized cellulose in the process of oxidative degumming of ramie
  • A method for regulating the generation of oxidized cellulose in the process of oxidative degumming of ramie

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Embodiment 1

[0025] A method for regulating the generation of oxidized cellulose in the process of oxidative degumming of ramie is as follows:

[0026] With hydrogen peroxide 1.0kg, sodium benzoate 0.5kg, urea 0.4kg, sodium tripolyphosphate 0.3kg, sodium polyacrylate 0.3kg, add 97.5kg water and be made into degumming liquid (the mass ratio of ramie hemp and degumming liquid is 1: 10). Immerse 10 kg of ramie raw material in the degumming solution, adjust the pH value of the degumming solution to 10.0 with 0.1 mol / L NaOH solution, and continuously stir the mixture of ramie raw material and degumming solution at a speed of 200 rpm with a magnetic stirrer. Raise the temperature from room temperature to 85°C at a rate of 2°C / min, keep it at this temperature for 100min, and use the oxidizing properties of peroxide to fully remove the gum in the raw ramie. As the reaction progressed, the ramie fibers in the degumming process were sampled at different time points, and the functional group content...

Embodiment 2

[0033] A method for regulating the generation of oxidized cellulose in the process of oxidative degumming of ramie is as follows:

[0034] With sodium percarbonate 0.2kg, acetanilide 0.05kg, urea 0.05kg, sodium dodecylbenzenesulfonate 0.05kg, sodium tartrate 0.05kg, add 99.6kg water and be made into degumming liquid (the mass ratio of ramie raw hemp and degumming liquid is 1:10). Immerse 10kg of ramie raw material in the degumming solution, adjust the pH value of the degumming solution to 14.0 with 0.1mol / L NaOH solution, and continuously stir the mixture of ramie raw material and degumming solution at a speed of 200rpm with a magnetic stirrer. Raise the temperature from room temperature to 50°C at a rate of 1°C / min, keep it at this temperature for 150min, and use the oxidizing property of peroxide to fully remove the gum in the raw ramie. As the reaction progressed, the ramie fibers in the degumming process were sampled at different time points, and the functional group cont...

Embodiment 3

[0039] A method for regulating the generation of oxidized cellulose in the process of oxidative degumming of ramie is as follows:

[0040] With urea peroxide 0.8kg, sodium citrate 0.4kg, thiourea 0.2kg, sodium metaphosphate 0.2kg, sodium polyacrylate 0.1kg, add 98.3kg water and be made into degumming liquid (the mass ratio of ramie hemp and degumming liquid is 1 :10). Immerse 10 kg of ramie raw material in the degumming solution, adjust the pH value of the degumming solution to 8.0 with 0.1 mol / L NaOH solution, and continuously stir the mixture of ramie raw material and degumming solution at a speed of 200 rpm with a magnetic stirrer. Raise the temperature from room temperature to 100°C at a rate of 5°C / min, keep it at this temperature for 40 minutes, and use the oxidizing property of peroxide to fully remove the gum in the raw ramie. As the reaction progressed, the ramie fibers in the degumming process were sampled at different time points, and the functional group content o...

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Abstract

The invention provides a regulation method of generation of oxidized cellulose in a ramie oxidizing and degumming process. The regulation method includes the following steps: preparing a degumming liquid and mixing raw hemp of ramie with the degumming liquid; regulating the pH of the degumming liquid; heating and stirring the mixture to fully removal colloid through oxidizing property of peroxides; on-line detecting generation quantity of the oxidized cellulose; and optimizing and regulating the pH, reaction temperature, reaction time and chemical reagent concentration in real time to control the aldehyde group content in the oxidized cellulose to be 15-40 [mu]mol / g and the carboxyl group content to be 120-200 [mu]mol / g, so that the fiber crystallization degree, polymerization degree, strength, breaking elongation and fineness of the prepared fine dry ramie fiber are maximum and the degumming efficiency and the physical mechanical performance are best within the ranges of the parameters. The method can increase degumming efficiency and reduce fiber damage, achieves best degumming effect, achieves optimum control in the preparation process of the ramie fiber, and has important theoretical meaning and application value.

Description

technical field [0001] The invention relates to a method for regulating the generation of oxidized cellulose in the process of oxidative degumming of ramie, and belongs to the technical field of oxidative degumming of hemp fibers and characterization and regulation of cellulose oxidation in analytical chemistry in the field of textiles. Background technique [0002] With the continuous depletion of non-renewable resources such as oil, natural gas, and coal, people pay more and more attention to green and environmentally friendly materials. Cellulose and its derivatives are receiving more and more attention because of their wide distribution, high content, good biocompatibility, degradability, and environmental friendliness. Plant fibers are fibers obtained from seeds, fruits, stems, leaves and other parts of plants, and are natural renewable fibers. Among all kinds of plant fibers, ramie is a kind of hemp fiber with excellent quality. After the raw hemp is degummed and refi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01C1/02
Inventor 李召岭周佳佳孟超然郁崇文杨建平丁金花刘凤明
Owner DONGHUA UNIV
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