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Polyvinyl-alcohol-based porous adsorption material and preparing method thereof

A polyvinyl alcohol-based, polyvinyl alcohol-based technology, applied in the field of polyvinyl alcohol-based porous adsorption materials and its preparation, can solve the problems of product pore size and porosity reduction, uneven grafting rate distribution, and affecting adsorption effects, etc.

Inactive Publication Date: 2019-11-05
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of grafting the polyvinyl alcohol sponge skeleton, affected by the body shape of the skeleton itself, there will be uneven distribution of the grafting rate on the surface and inside of the material, and after the nucleophilic substitution in the later stage, it can be seen from the electron microscope that the pore size of the product and porosity are greatly reduced, which will affect the adsorption effect, and the adsorption capacity of the material as a whole is quite different.

Method used

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preparation example Construction

[0030] The invention provides a preparation method of a polyvinyl alcohol-based porous adsorption material, comprising the following steps:

[0031] A) under the action of a catalyst, the polymer foam material containing hydroxyl groups is reacted with a functional modifier in a solvent to obtain a modified polymer foam material;

[0032] The polymer foam material containing hydroxyl groups includes one or more of polyvinyl alcohol-based foam materials containing carboxyl groups, polyvinyl alcohol-based foam materials containing sulfonic acid groups, and polyvinyl alcohol foam materials;

[0033] The functional modifier includes chloroacetyl chloride, bromobutyryl bromide, chloropropionyl chloride, chlorobutyryl chloride or epichlorohydrin;

[0034] B) reacting the modified polymer foam material with a solution of macromolecular substances containing amino groups to obtain a polyvinyl alcohol-based porous adsorption material.

[0035] In some embodiments of the present invent...

Embodiment 1

[0125] Add 200mL of methanol into a 500mL dry four-necked bottle, then measure 70g of vinyl acetate and pour it into the four-necked bottle, fill it with nitrogen at room temperature for 30 minutes and stir evenly, then move the four-necked bottle into a 65°C water bath, stir it magnetically, and add Vinyl acetate monomer 0.08 mole percent AIBN initiated the reaction. Under the protection of nitrogen, acrylic acid monomers accounting for 3% of the molar fraction of VAc were dropped into the reaction system at a constant rate of 1 drop / min through a constant pressure dropping funnel, and reacted under nitrogen protection at 65°C for 5 hours to obtain a viscous copolymer. substance solution. The copolymer solution was prepared as a methanol solution with a mass fraction of 33%. Add an appropriate amount of 1mol / L NaOH methanol solution at room temperature to make the molar ratio of NaOH to VAc reach 0.02. After mixing evenly, the reaction solution was placed in a constant temp...

Embodiment 2

[0128] Add 900g of concentrated sulfuric acid dropwise into a three-necked round-bottomed flask equipped with 1500mL N,N-dimethylformamide cooled in an ice-water bath, stir mechanically, and control the dropping time at 2h. During the reaction, keep the temperature of the solution below 40°C, and after 30 minutes of reaction, yellow DMF-SO 3 Store refrigerated. After dissolving 4g of PVA-117 in 100mL of DMF, add the DMF-SO prepared above 3 The solution was 290 mL, stirred and reacted in an ice-water bath at 5°C for 2 hours, precipitated with acetone, neutralized with sodium hydroxide solution, and dried to obtain polyvinyl alcohol containing sulfonic acid groups with a degree of polymerization of 1700 and a degree of alcoholysis of 99%.

[0129] 120g polyvinyl alcohol (PVA-117) with a degree of polymerization of 1700 and a degree of alcoholysis of 99%, 60g of polyvinyl alcohol (PVA-SO) modified with a sulfonic acid group with a degree of alcoholysis of 99% 3 Na), fed into a ...

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Abstract

The invention relates to the technical field of polymer synthesis, in particular to a polyvinyl-alcohol-based porous adsorption material and a preparing method thereof. The preparing method comprisesthe steps of A) under the effect of a catalyst, carrying out a reaction between a polymer foam material containing hydroxyl groups and a functionalized modifier in a solvent to obtain a modified polymer foam material, wherein the polymer foam material containing the hydroxyl groups comprises one or more of a polyvinyl-alcohol-based foam material containing carboxyl groups, a polyvinyl-alcohol-based foam material containing sulfonic groups and a polyvinyl alcohol foam material, and the functionalized modifier comprises chloroacetyl chloride, bromobutyryl bromide, chloropropionyl chloride, chlorobutyryl chloride or epoxy chloropropane; B) carrying out a reaction between the modified polymer foam material and a solution of a macromolecular substance containing amino groups to obtain the polyvinyl-alcohol-based porous adsorption material. The prepared polyvinyl-alcohol-based porous adsorption material has excellent adsorption performance on heavy metal ions, and meanwhile, the preparing technology is simple.

Description

technical field [0001] The invention relates to the technical field of polymer synthesis, in particular to a polyvinyl alcohol-based porous adsorption material and a preparation method thereof. Background technique [0002] With the rapid development of the economy, industries such as smelting, electrolytic plating, coatings, dyes, and pharmaceuticals discharge a large amount of industrial wastewater containing heavy metal ions every year. These heavy metals pass through the soil, water, air, and especially the food chain, causing serious damage to human health. harm. At the same time, heavy metal ions are not easily decomposed and destroyed, and will cause irreversible harm once discharged into the environment. Therefore, how to remove heavy metal ions in water has always been a hot issue. [0003] Compared with many current methods, the use of adsorbents to treat such pollutants in water has the advantages of convenience, high efficiency, and easy operation. The solubil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26C02F1/28B01J20/30C02F101/20
CPCB01J20/265C02F1/285C02F2101/20
Inventor 许玖多姬相玲沙迪石凯王宝龙杨旭
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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