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Method for preparing ramie based on oxidation reduction potential regulation

A technology of ramie fiber and potential regulation, which is applied in the direction of producing bast fiber by chemical method, can solve the problems of lean hemp quality and physical and mechanical properties, fiber damage, etc., to save energy and chemical consumption, ensure quality, and achieve the best The effect of optimal control

Inactive Publication Date: 2014-07-23
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, peroxides have strong oxidative properties. If the operating conditions are not properly controlled, oxidative degumming may cause fiber damage, resulting in a decline in the quality and physical and mechanical properties of dry hemp.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing ramie fibers based on oxidation-reduction potential regulation is as follows:

[0032] 1.2 kg of hydrogen peroxide, 0.4 kg of sodium tripolyphosphate, 0.2 kg of urea, 0.2 kg of sodium benzoate, and 98.0 kg of water were added to form a degumming solution (the mass ratio of ramie hemp and degumming solution was 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 100 rpm with a magnetic stirrer. The temperature was raised from room temperature, raised to 90°C within 30 minutes at a rate of 2°C / min, and kept at this temperature for 60 minutes. Before the test, the platinum electrode and the redox electrode were cleaned with deionized water, and placed in air to dry naturally. Insert the OPR potentiometer into the reactor, and as the reaction progresses, take ...

Embodiment 2

[0038] A method for preparing ramie fibers based on oxidation-reduction potential regulation is as follows:

[0039]0.3 kg of sodium percarbonate, 0.05 kg of polysorbate, 0.1 kg of thiourea, 0.05 kg of sodium citrate, and 45.5 kg of water are added to form a degumming solution (the mass ratio of ramie hemp and degumming solution is 1:5). Immerse 10 kg of ramie raw material in the degumming solution, adjust the pH value of the degumming solution to 11.0 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. The temperature was raised from room temperature, raised to 100°C within 60 minutes at a rate of 1°C / min, and kept at this temperature for 40 minutes. Before the test, the platinum electrode and the redox electrode were cleaned with deionized water, and placed in air to dry naturally. Insert the OPR potentiometer into the reactor, and as the reaction progresses, take differe...

Embodiment 3

[0045] A method for preparing ramie fibers based on oxidation-reduction potential regulation is as follows:

[0046] With 0.9 kilogram of peroxodisulfuric acid, 0.6 kilogram of lauryl ammonium sulfate, 0.4 kilogram of copper ethylenediamine, 0.4 kilogram of polyacrylamide, add 197.7 kilograms of water and be made into degumming solution (the mass ratio of ramie hemp and degumming solution is 1: 20). Immerse 10 kg of ramie raw material in the degumming solution, adjust the pH value of the degumming solution to 13.0 with 0.1 mol / L NaOH solution, and continuously stir the mixture of ramie raw material and degumming solution at a speed of 300 rpm with a magnetic stirrer. The temperature was raised from room temperature, raised to 50°C within 30 minutes at a rate of 1°C / min, and kept at this temperature for 120 minutes. Before the test, the platinum electrode and the redox electrode were cleaned with deionized water, and placed in air to dry naturally. Insert the OPR potentiomete...

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Abstract

The invention provides a method for preparing ramie based on oxidation reduction potential regulation. The method comprises the steps of preparing a degumming solution, mixing raw ramie and degumming solution, adjusting pH value of the degumming solution, heating, stirring, and completely removing colloid by utilizing the oxidability of peroxides; optimizing and adjusting the pH value, the reaction temperature, the reaction time and the concentration of a chemical reagent in real time by detecting oxidation reduction potential (ORP) parameter in an online manner; and controlling the initial ORP value of the degumming solution between +320mV and +360mV, the residual gum content the prepared fiber is reduced to be below 2.3%, the polymerization degree, the strength and the elongation at break of refined dry flax are the maximum relatively, and the degumming efficiency and the physical and mechanical properties are the best within the range. According to the method, the change of the ORP value is changed to regulate the oxidation degumming process, the degumming efficiency is improved, the fiber damage is alleviated, the excellent degumming effect is achieved, the optimized control of the ramie preparation process is realized, and important theoretical and application significances are achieved.

Description

technical field [0001] The invention relates to a method for preparing ramie fiber based on oxidation-reduction potential regulation, which belongs to the technical field of oxidation degumming of hemp fiber and application of oxidation-reduction potential in electrochemistry in the textile field. Background technique [0002] Ramie is a unique crop in China mainly used for textiles. Ramie fibers are slender, strong, white and shiny in appearance, and have large voids in the fiber structure, good air permeability, high water absorption and fast moisture dissipation, and can be woven into linen, aircraft wing cloth, fishing nets, carpets, sacks, etc. It can be blended with wool and cotton to make high-grade clothing materials, and can also be used as raw materials for high-grade paper, gunpowder, and rayon. The main component of ramie fiber is cellulose, and the non-cellulose substances wrapped on the surface of cellulose are collectively called colloid. Before spinning, he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01C1/02
Inventor 李召岭刘凤明孟超然郁崇文白洋臧英明
Owner DONGHUA UNIV
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