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Preparation method of cationic polystyrene resin

A polystyrene resin, cationic technology, applied in the field of preparation of cationic polystyrene resin, can solve the problems of low surface charge, high cost, environmental pollution, etc., achieve high grafting rate, avoid adverse effects, and less dosage Effect

Active Publication Date: 2018-12-21
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for preparing a cationic polystyrene resin with highly positively charged groups on the surface, which solves the problem of the low surface charge of the existing large-diameter cationic polystyrene resin and the difficulty in the preparation process. Difficult to control, pollute the environment and high cost

Method used

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  • Preparation method of cationic polystyrene resin

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preparation example Construction

[0022] The invention discloses a preparation method of cationic polystyrene resin, said method comprising the following steps:

[0023] Step 1. Pretreatment of unmodified polystyrene resin: Weigh a certain amount of polystyrene resin microspheres, add dichloromethane to swell for 10-14 hours, and then use tetrahydrofuran, ultrapure water, absolute ethanol and methanol Wash and filter 2-4 times, and finally vacuum-dry at 40°C to constant weight;

[0024] Step 2, acylation of polystyrene resin: Weigh the polystyrene resin microspheres treated in step 1, add carbon disulfide to swell for 12 hours, add 2-bromo-2-methylpropionyl bromide dropwise, and batch by batch Slowly add aluminum tribromide, under the condition of 30-70°C, condense and reflux for 60-300 minutes, stop the reaction with ultrapure water, cool to room temperature, wash and filter with methanol and ultrapure water 3-5 times, and finally 40°C Under vacuum drying to constant weight to obtain acylated polystyrene res...

Embodiment 1

[0031]Example 1: Acylation of polystyrene resin: Weigh the pretreated polystyrene resin white balls into a three-necked flask, add 150 ml of carbon disulfide to swell for 12 hours, and obtain 1.5 g of polystyrene resin. 1.488 g of 2-bromo-2-methylpropionyl bromide was added dropwise with a constant pressure titration funnel, while 2.2 g of catalyst aluminum tribromide was slowly added in batches. Under the condition of 40°C, condense and reflux for 100 minutes, stop the reaction with ultrapure water, cool to room temperature, wash and filter with methanol and ultrapure water 4 times, and finally vacuum dry at 40°C to constant weight to obtain acylated polystyrene resin microspheres.

[0032] Cationic modification of polystyrene resin microspheres: Take 0.25 grams of acylated polystyrene resin microspheres and put them into a single-necked flask, add 7.5896 grams of dimethylformamide solution to swell for 240 minutes, and then add catalyst brominated ketone 0.0156 grams, 0.064...

Embodiment 2

[0033] Example 2: Acylation of polystyrene resin: Weigh the pretreated polystyrene resin white balls into a three-necked flask, add 29 grams of carbon disulfide to swell for 12 hours, and obtain 1.0 g of polystyrene resin. 1.86 g of 2-bromo-2-methylpropionyl bromide was added dropwise with a constant pressure titration funnel, and at the same time, 2.0 g of catalyst aluminum tribromide was slowly added in batches. Under the condition of 50°C, reflux reaction for 120 minutes, stop the reaction with ultrapure water, after cooling to room temperature, wash and filter with methanol and ultrapure water 4 times, and finally vacuum dry at 40°C to constant weight to obtain acylated polystyrene resin microspheres.

[0034] Cationic modification of polystyrene resin microspheres: Take 0.25 grams of acylated polystyrene resin microspheres and put them into a single-necked flask, add 7.5896 grams of dimethylformamide solution to swell for 240 minutes, and then add catalyst brominated keto...

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Abstract

The invention provides a preparation method of cationic polystyrene resin. The unmodified resin used in the method is a large-particle-size macroporous polystyrene resin microspheres, and a cationic polymer for modification is polymethacryloxyethyltrimethyl ammonium chloride; the method comprises the steps of firstly, swelling polystyrene resin microspheres by using dichloromethane, then washing and filtering for a plurality of times successively with tetrahydrofuran, ultrapure water, absolute ethanol and methanol, and finally carrying out vacuum drying; then, utilizing a friedel-crafts acylation reaction to graft the surfaces of the pretreated microspheres with an acylating reagent 2-bromo-2-methylpropionyl bromide so as to obtain an acylated polystyrene resin macroinitiator; finally, initiating the polymerization of a cationic monomer, i.e., methacryloxyethyltrimethyl ammonium chloride by using an atom transfer radical polymerization method of a catalyst generated by electron transfer as well as taking cuprous bromide as the catalyst and ascorbic acid as a reducing agent. The preparation method provided by the invention solves the problems that the existing large-particle-size cationic polystyrene resin is low in surface charge amount and difficult in control of a preparation process, pollutes the environment, and is high in cost.

Description

【Technical field】 [0001] The invention relates to a preparation method of cationic polystyrene resin. 【Background technique】 [0002] Polymer adsorption resin has the characteristics of high specific surface area, high mechanical strength, adjustable resin pore structure and easy regeneration. It is widely used in the field of wastewater treatment and can recover useful substances from wastewater. It has a good environment benefits and economic benefits. Polystyrene resin microspheres (Polystyrene, referred to as PS) is a polymer prepared from styrene as the main material and divinylbenzene as the crosslinking agent, and is the main skeleton material of the adsorption resin. A porogen such as a precipitating agent, an inert organic solvent or a linear high polymer is added during the suspension copolymerization of styrene and divinylbenzene, and the porogen is taken out after the polymerization is completed to obtain porous polystyrene resin microspheres. Polystyrene cross...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F257/00C08F220/34C08F8/10
CPCC08F8/10C08F257/00C08F220/34
Inventor 苗庆显周帅陈礼辉黄六莲吴慧肖禾
Owner FUJIAN AGRI & FORESTRY UNIV
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