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A kind of pH-responsive plant fiber functional material and its preparation method and application

A technology of plant fibers and functional materials, applied in separation methods, chemical instruments and methods, immiscible liquid separation, etc. body grafting rate, etc.

Active Publication Date: 2020-08-11
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the existing pH-responsive materials cannot be adjusted or designed by themselves, and cannot cope with the complex and changeable external environment.
Most of the existing pH-responsive materials use amphoteric monomers to form amphoteric polymers, which are then coated on the surface of the paper base and physically bonded to the paper base. The polymers are easy to fall off and the regeneration performance is poor.
The existing pH-responsive materials are prone to homopolymerization of pH-responsive monomers during the preparation process, so that a homopolymer is formed on the surface of the pH-responsive material, which affects the efficiency of oil-water separation and the pH-responsive monomer on the fiber. Grafting rate of
Existing pH-responsive materials are not sensitive enough to achieve wettability transitions between a small range of pH values
Existing pH-responsive materials are easily restricted by the environment during oil-water separation, resulting in reduced oil-water separation efficiency, resulting in material loss, and poor biological performance, which will cause secondary pollution to the environment during use

Method used

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  • A kind of pH-responsive plant fiber functional material and its preparation method and application
  • A kind of pH-responsive plant fiber functional material and its preparation method and application
  • A kind of pH-responsive plant fiber functional material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Preparation of pH-responsive plant fiber functional material

[0042] ① Fully disperse 1 g of bagasse pulp fibers in 600 g of water, add 1.2 g of ferrous ammonium sulfate, and at a stirring speed of 250 rpm, pass through nitrogen gas for 40 minutes to remove oxygen, so that free radicals are generated on the fiber surface, and a bagasse pulp fiber dispersion is obtained;

[0043] ②Dissolve 1g of buthenic acid in the bagasse pulp fiber dispersion prepared in step ①, react at a constant temperature of 90°C and a stirring speed of 190rpm, and use attenuated total reflection-ultraviolet / visible spectroscopy to analyze the reaction during the grafting process in real time The concentration of butene acid in the system was adjusted to maintain the concentration of butene acid at 0.138mol / L, and the reaction time was controlled at 7h to obtain a bagasse pulp fiber dispersion with negative pH responsiveness;

[0044] ③Dissolve 4g of crotonamide in the negative pH-res...

Embodiment 2

[0047] Example 2: Preparation of pH-responsive plant fiber functional material

[0048] ① Fully disperse 1g of bamboo pulp fibers in 600g of water, add 1.8g of cyclohexanone peroxide, and at a stirring speed of 300rpm, pass nitrogen gas for 30min to remove oxygen, so that free radicals are generated on the fiber surface, and a bamboo pulp fiber dispersion is obtained ;

[0049] ②Dissolve 1g of pentenoic acid in the bamboo pulp fiber dispersion prepared in step ①, react at a constant temperature of 60°C and a stirring speed of 180rpm, and use attenuated total reflection-ultraviolet / visible spectroscopy to analyze the reaction during the grafting process in real time The concentration of pentenoic acid in the system was adjusted to maintain the concentration of pentenoic acid at 0.138mol / L, and the reaction time was controlled at 4h to obtain a bamboo pulp fiber dispersion with negative pH responsiveness;

[0050] ③Dissolve 3g of pentenamide in the negative pH-responsive bamboo...

Embodiment 3

[0053] Example 3: Preparation of pH-responsive plant fiber functional material

[0054] ① Fully disperse 1g of bamboo pulp fibers in 600g of water, add 2.0g of cyclohexanone peroxide, and at a stirring speed of 200rpm, pass nitrogen gas for 30min to remove oxygen, so that free radicals are generated on the surface of the fibers to obtain a bamboo pulp fiber dispersion ;

[0055] ②Dissolve 1g of pentenoic acid in the bamboo pulp fiber dispersion prepared in step ①, react at a constant temperature of 60°C and a stirring speed of 150rpm, and use attenuated total reflection-ultraviolet / visible spectroscopy to analyze the reaction during the grafting process in real time The concentration of pentenoic acid in the system was adjusted to maintain the concentration of pentenoic acid at 0.138mol / L, and the reaction time was controlled at 4h to obtain a bamboo pulp fiber dispersion with negative pH responsiveness;

[0056] ③Dissolve 2g of pentenamide in the negative pH-responsive bambo...

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Abstract

The invention discloses a pH responsive plant fiber functional material as well as a preparation method and application thereof. With a plant fiber as a matrix, the grafting of a negative pH responsive group and a positive pH responsive group is initiated on the surface of the plant fiber by a free radical; the concentration of negative pH responsive monomers and positive pH responsive monomers ina reaction system are maintained at 0.138-0.552 mol / L and 0.14-0.56 mol / L, respectively, and the sequence of adding the monomers is also controlled, so as to enable the mass ratio of the negative pHresponsive group and the positive pH responsive group grafted on the surface of the plant fiber to be 1:(2-4) or (2-4):1 and the total grafting ratio of the groups on the surface of the plant fiber tobe 50%-80%. Therefore, the material has higher pH responsive sensitivity in a narrower pH range, and two-way intelligent conversion between hydrophilic oleophobicity and lipophilic hydrophobicity ofthe material is achieved. The material is of high oil-water separation efficiency, good regeneration stability and good environmental suitability.

Description

technical field [0001] The invention belongs to the field of surface modification of fiber materials, and in particular relates to a pH-responsive plant fiber functional material and a preparation method and application thereof. Background technique [0002] With the rapid development of the world economy, more and more environmental problems have emerged. The problem of oily sewage discharge and oil spill is becoming more and more serious. These environmental problems pose a serious threat to ecological balance and human health. For example, in 2013, the oil spill in the sea area of ​​Rayong Province, Thailand caused a large area of ​​sea area to be polluted by crude oil, resulting in the destruction of the living environment of a large number of marine animals and suffocation to death. In addition, if the oil in the engine contains moisture and impurities, it will not only shorten the service life of the engine, but also cause safety hazards in transportation. The purifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F289/00C08F220/54C08F220/06C08F220/04C08F220/56B01D17/022
CPCB01D17/02C08F289/00C08F220/06C08F220/54C08F220/04
Inventor 何辉程梅笑朱红祥李云华
Owner GUANGXI UNIV
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