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A kind of synthetic method of polyacrylamide inverse emulsion

A polyacrylamide and inverse emulsion technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of explosion, high emulsifier content and high monomer concentration, and achieve lower production costs, low emulsifier content, The effect of large-scale production

Active Publication Date: 2018-11-30
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyacrylamide inverse emulsion has gradually become the mainstream of polyacrylamide products. It has the characteristics of fast dissolution and convenient use, but the product has too much emulsifier content. In addition, due to the high monomer concentration and high polymerization heat in the polymerization process, It is difficult for general polymerization kettles to dissipate heat in time, resulting in explosion or gel, and even accidents such as flushing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: In a 500ml four-necked flask equipped with a stirrer, a thermometer, a condenser and a gas inlet and outlet, add 100g of 43wt% acrylamide aqueous solution, 2g of anhydrous sodium acetate, and the emulsifier sorbitan monolaurate 7.5g of ester (Span 60) and 2.5g of OP-10, after stirring for 10min, add 180ml of cyclohexane, control the temperature of the water bath at 25°C and stir for 30min, while passing high-purity nitrogen to remove the oxygen in the system. Add 0.1ml of 1% ammonium persulfate aqueous solution and 0.5ml of 5% sodium bisulfite aqueous solution to trigger, rise to the highest temperature, keep the reaction for 1h, and prepare non-ionic polyacrylamide inverse emulsion semi-finished product.

[0019] Step 2: Add 100ml of acrylamide aqueous solution with a mass concentration of 43% to another 300ml beaker with a stirrer, add 2g of anhydrous sodium acetate and stir until dissolved, and adjust the temperature to 25°C.

[0020] The third step: Add the ...

Embodiment 2

[0022] Step 1: In a 500ml four-neck flask equipped with a stirrer, a thermometer, a condenser and a gas inlet and outlet, add 100g of 30wt% acrylamide aqueous solution and 37.5g of 2-acrylamido-2-methylpropanesulfonic acid , with a mass concentration of 20% sodium hydroxide aqueous solution to adjust the pH value of the system to 5.0. Add emulsifier sorbitan monolaurate (Span 40) 12g and OP-103.5g, stir for 10min, add cyclohexane 200ml, control the temperature of the water bath at 25°C and stir for 30min, at the same time pass high-purity nitrogen to remove the oxygen. Add benzoin (1 mg in 0.1 ml glacial acetic acid), irradiate the system with a 250W high-pressure mercury lamp to initiate it, and wait for the temperature to rise to the highest temperature, and keep it warm for 1 hour to prepare an anionic polyacrylamide inverse emulsion semi-finished product.

[0023] The second step: in another 300ml beaker with a stirrer, add 100ml of acrylamide aqueous solution with a mass...

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Abstract

The invention belongs to the field of water-soluble polymer materials, and relates to a synthesis method of polyacrylamide inverse emulsion with low emulsifier content. The synthesis method is characterized by polymerizing in two steps; in the first step, a sufficient amount of an emulsifier and a large amount of an organic solvent are used, so that gel is enabled not to be produced in a polymerization process, and the phenomenon of implosion caused by not timely cooling can be avoided; in the second step, during polymerization, the emulsifier is used less or not used based on the polymerization in the first step, and gelation or demulsification is not caused in the polymerization process due to the existence of seed emulsion in the first step. Part of the material is polymerized, so that the polymerization heat produced in the polymerization of the second step is greatly reduced; the requirement of condensation can be reached by means of jacket cooling water in a polymerization kettle, so that the phenomenon of implosion is also avoided, and the safe production is further guaranteed. After the method is adopted, the emulsifier content of a polymerization reaction is reduced without causing demulsification, the production safety is improved, and the production cost is lowered.

Description

technical field [0001] The invention relates to the field of water-soluble polymer materials, in particular to a method for synthesizing polyacrylamide inverse emulsion. Background technique [0002] With the development of polymerization technology, polyacrylamide has developed from the initial dry powder (colloid) to the current two main products of dry powder and inverse emulsion. In the 1980s, the industrialized production of polyacrylamide inverse emulsion products was obtained, and its development speed was quite fast. [0003] During inverse emulsion polymerization of acrylamide, the stability of the emulsion is a very important indicator for both polymerization and products, and it is also a difficult point of this method. The key to solving this problem is to choose an appropriate emulsifier system, because the emulsifier forms an adsorption film on the outermost layer of the latex particles, and through the barrier of the adsorption film, the particles can be prev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/32C08F2/30C08F2/48C08F220/58C08F220/56C08F120/56C02F1/56
CPCC02F1/56C08F2/30C08F2/32C08F2/48C08F120/56C08F220/58C08F220/56
Inventor 赵芳秦绪平
Owner SHANDONG UNIV
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