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Preparation method of cationic high-molecular polymer

A high molecular polymer and cationic technology, applied in the field of chitosan, can solve the problems of being poor and only soluble in acidic solutions, and achieve the effects of low flocculation effect, excellent flocculation performance, and avoiding gelation

Active Publication Date: 2018-07-20
SHAANXI UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chitosan is a resource for sustainable development. It has the outstanding characteristics of wide sources, safety and non-toxicity, low price, little influence on pH changes, easy biodegradation, and environmental friendliness. Sugar flocculants are used in various water treatments, but because of their poor water solubility, they can only be dissolved in acidic solutions, but insoluble in neutral or alkaline solutions. Therefore, the research hotspot at home and abroad is to modify chitosan to improve its application scope

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  • Preparation method of cationic high-molecular polymer
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  • Preparation method of cationic high-molecular polymer

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[0030] The present invention also provides a preparation method of a cationic high molecular polymer, comprising free radical copolymerization of hydroxypropyl chitosan, acryloyloxyethyltrimethylammonium chloride (DAC) and acrylamide (AM), to obtain a cationic high molecular weight polymer. Molecular polymers, that is, cationic polymers, the specific process is:

[0031] see figure 1 , step 1, acrylamide is divided into two parts, and each part is added to water to obtain the first part of acrylamide aqueous solution and the second part of acrylamide aqueous solution; hydroxypropyl chitosan is added to three ports containing 25mL distilled water In the flask, stir to dissolve evenly;

[0032] Step 2, pass nitrogen gas for 30 minutes to remove oxygen, and raise the temperature to 50-80°C;

[0033] Step 3, add a certain amount of cerium ammonium nitrate aqueous solution, trigger 20min;

[0034] Step 4, slowly dropwise adding a mixture of a certain amount of acryloyloxyethyltr...

Embodiment 1

[0045] A method for preparing a cationic high molecular polymer, comprising free radical copolymerization of hydroxypropyl chitosan and acrylamide, acryloyloxyethyltrimethylammonium chloride to obtain a cationic high molecular polymer, the specific process is:

[0046] Step 1, divide the acrylamide into two parts, and add each part into water to obtain the first part of acrylamide aqueous solution and the second part of acrylamide aqueous solution; add 1g of hydroxypropyl chitosan into three ports containing 25mL of distilled water In the flask, stir at 250r / min to make it dissolve evenly;

[0047] Step 2, pass nitrogen gas for 30 minutes to remove oxygen, and raise the temperature to 55°C;

[0048] Step 3, adding cerium ammonium nitrate aqueous solution with a mass concentration of 0.22%, and initiating for 20 minutes; the mass of ceric ammonium nitrate is 1.1% of the mass of hydroxypropyl chitosan.

[0049] Step 4, slowly dropwise adding a mixture of an aqueous solution of ...

Embodiment 2

[0055] A method for preparing a cationic high molecular polymer, comprising free radical copolymerization of hydroxypropyl chitosan and acrylamide, acryloyloxyethyltrimethylammonium chloride to obtain a cationic high molecular polymer, the specific process is:

[0056] Step 1, divide the acrylamide into two parts, and add each part into water to obtain the first part of acrylamide aqueous solution and the second part of acrylamide aqueous solution; add 1g of hydroxypropyl chitosan into three ports containing 25mL of distilled water In the flask, stir at 250r / min to make it dissolve evenly;

[0057] Step 2, pass nitrogen gas for 30 minutes to remove oxygen, and raise the temperature to 65°C;

[0058] Step 3, adding cerium ammonium nitrate aqueous solution with a mass concentration of 0.42%, and triggering for 20 minutes; the mass of ceric ammonium nitrate is 2.1% of the mass of hydroxypropyl chitosan.

[0059] Step 4, slowly dropwise adding a mixture of acryloyloxyethyltrimeth...

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Abstract

The invention relates to a preparation method of a cationic high-molecular polymer. The method comprises the steps of dividing acrylamide into two parts, and separately adding the two parts of acrylamide into water so as to obtain a first acrylamide water solution and a second acrylamide water solution; adding hydroxypropyl chitosan into a three-necked flask filled with distilled water, stirring to enable hydroxypropyl chitosan to be dissolved, removing oxygen and then heating up to 50-80 DEG C, then adding a ceric ammonium nitrate water solution, initiating a reaction for 20min, and then dropwise adding a mixture of an acryloyloxyethyltrimethyl ammonium chloride water solution and the first acrylamide water solution; after the dropwise addition is finished, dropwise adding the second acrylamide water solution, and the continuously carrying out a reaction for 4h; after the reaction is finished, treating to obtain the cationic high-molecular polymer. The prepared cationic high-molecularpolymer is high in density of positive charges, large in relative molecular mass and simple in aftertreatment; the product has good flocculating performance.

Description

technical field [0001] The invention belongs to the technical field of chitosan, and relates to a preparation method of a cationic polymer. Background technique [0002] The shortage of water resources has become a common problem, and countries pay more and more attention to the recycling of wastewater. Flocculation and sedimentation is one of the most widely used and low-cost sewage treatment methods. At present, the widely used flocculants are inorganic flocculants, but inorganic flocculants have obvious disadvantages, such as being greatly affected by pH changes, the flocs formed are fragile, and a large amount of activated sludge will be produced at the same time. The treated water contains Higher metal ions (such as aluminum ions). The development and use of organic flocculants make up for the deficiencies of inorganic flocculants in many aspects, but they are expensive, have great selectivity to flocculated colloids, are not easy to degrade, and will cause "teratogen...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/56C08F220/34C02F1/56
CPCC02F1/56C08F251/00C08F220/56
Inventor 郭睿张瑶韩双王宁高弯弯霍文生李秀环刘雪艳
Owner SHAANXI UNIV OF SCI & TECH
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