Ion exchange nonwoven fabric with high carboxyl content and preparation method thereof

An ion exchange and non-woven technology, applied in the field of high carboxyl content ion-exchange non-woven fabric and its preparation, can solve the problem of limiting the exchange capacity of ion-exchange non-woven fabric, expensive and rare operations of instruments and devices, low graft reaction efficiency, etc. problems, to achieve the effects of easy industrialization and implementation, fast exchange rate, and wide source of raw materials

Inactive Publication Date: 2011-06-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the above-mentioned method of introducing carboxyl groups on PP non-woven fabrics by graft polymerization to prepare ion-exchange non-woven fabrics (or ion-exchange fibers), although the means are different and the characteristics are different, there are the following problems (1) The instruments and devices are expensive and rare And the operation is complicated, such as 60 Co γ-ray source and high-energy electron gun; (2) γ-ray, high-energy electron beam and plasma discharge grafting technology are not limited to the su

Method used

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  • Ion exchange nonwoven fabric with high carboxyl content and preparation method thereof
  • Ion exchange nonwoven fabric with high carboxyl content and preparation method thereof
  • Ion exchange nonwoven fabric with high carboxyl content and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Cut a batch of circular PP non-woven fabrics with a diameter of 8cm (commercially available, specification: 8.5g / m 2 , thickness 64.5μm), soak in acetone for 12h to remove impurities such as surface oil and additives, take it out and dry it for later use.

[0041] Acetone is made into a mixed solvent with 50% (volume percentage) and distilled water, and acrylic acid, benzophenone and azobisisobutyronitrile are added to make a monomer solution for subsequent use, and the concentration of each component is 50% (volume percentage) of acrylic acid, Benzophenone 25.0g / L and azobisisobutyronitrile 0.5g / L.

[0042] Soak the clean and dry PP non-woven fabric in the above monomer solution for 1.5h, take out the PP non-woven fabric, spread it on a glass watch glass in a 2-layer stack, seal it with PE film (thickness 23μm) and pass through N 2 After exhausting the air, keep the sealed state and irradiate with a 500W ultraviolet lamp for 1.5h (irradiation distance is 15cm). Then ...

Embodiment 2

[0044] Repeat Example 1, only change the number of stacked layers of PP non-woven fabric to 3 layers, the average carboxyl content of the gained ion-exchange non-woven fabric is 12.86mmol / g, and its FTIR spectrogram is shown in figure 1 Spectrum line 2, its optical picture after water absorption and saturation is shown in Figure 2, and the scanning electron microscope (SEM) picture is shown in Figure 3.

[0045] figure 1 On the infrared absorption curves of PP non-woven fabrics and PP ion-exchange non-woven fabrics shown, 2960cm -1 The absorption at the position is attributed to the -CH in the PP molecule 2 stretching vibration, 1160-1650cm -1 The absorption attributed to =CH 2 -CH 3 bending deformation vibration. 1710.3cm -1 The absorption peak of is attributed to the carbonyl stretching vibration of acrylic acid, which confirms that acrylic acid has been successfully grafted on PP molecules in this example.

[0046] The saturated water absorption (24h / 25°C) of the PP ...

Embodiment 3

[0050] Example 1 was repeated, only the number of stacked layers of the PP non-woven fabric was changed to 4 layers during UV irradiation, and the average carboxyl content of the obtained ion-exchange non-woven fabric was 12.93 mmol / g.

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Abstract

The invention discloses an ion exchange nonwoven fabric with high carboxyl content and a preparation method thereof. The method comprises the following steps of: cleaning a polypropylene nonwoven fabric, drying, and soaking in acrylic acid monomer solution prepared from an acetone/water mixed solvent at room temperature under the lightproof condition; stacking a plurality of layers of soaked nonwoven fabrics, spreading on a supporting utensil, and irradiating by using an ultraviolet lamp; and taking out, separating the layers of nonwoven fabrics, boiling for multiple times by using boiling water to remove unpolymerized acrylic acid and homopolymer thereof, and drying to obtain the ion exchange nonwoven fabric with the high carboxyl content, wherein the carboxyl content of the nonwoven fabric is more than 10mmol/g, and the capacities of adsorbing pb<2+> and methylene blue of the nonwoven fabric are 104.5mg/g and 835.0mg/g. The production process is short, the process is simple, applicability is high, special equipment is not needed, raw material sources are wide, industrial popularization is easy to implement, and the ion exchange nonwoven fabric can be widely applied to the fields of water treatment, noble metal ion recovery, medicine separation and extraction, battery diaphragm materials and the like.

Description

technical field [0001] The invention relates to wastewater treatment, in particular to an ion-exchange non-woven fabric with high carboxyl content and a preparation method thereof. Background technique [0002] Industrial and agricultural production wastewater contains certain heavy metal ions and ionic dyes. In recent years, under pressure from many aspects such as the environment, resources, legislation and society, the discharge limit standards for many toxic and harmful components have been continuously increased. Specific products such as heavy metals in juice The content of ions can even determine its market access or not. Therefore, the demand for clean technology and effective wastewater treatment technology in production is becoming more and more urgent. Although methods such as precipitation method, electrochemical method and membrane filtration can be used to remove heavy metal ions and ionic dyes in water, technical and economic reasons are limited. its applicat...

Claims

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Application Information

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IPC IPC(8): D06M14/18D06M14/28D06M14/32D06M14/30D06M14/22D06M14/24B01D15/04C02F1/42H01M2/16
CPCY02E60/12Y02E60/10
Inventor 唐辉沈博张晓春
Owner KUNMING UNIV OF SCI & TECH
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