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Preparation method of hydrophobic modified polyacrylamide

A technology of polyacrylamide and hydrophobic modification, applied in the field of preparation of hydrophobically modified polyacrylamide, can solve the problems of high price and low molecular weight.

Active Publication Date: 2017-09-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main production methods of hydrophobically associated polyacrylamide are micellar copolymerization and inverse emulsion / inverse microemulsion copolymerization. In addition to the use of expensive hydrophobic monomers, the products of micelle copolymerization are due to the hydrophobic single The effect of the body, the molecular weight is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add 100g of 43wt% acrylamide aqueous solution, 10g of emulsifier sorbitan monolaurate and 2.5g of octylphenol polyoxyethylene ether in a 500ml four-neck flask with stirrer, thermometer, condenser and gas inlet and outlet. After stirring for 10 minutes, add 100ml of kerosene, control the temperature of the water bath at 25°C and stir for 30 minutes, while passing carbon dioxide 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, and keep it at 60°C for 1h to prepare nonionic polyacrylamide inverse emulsion. Then add 5g of n-hydroxymethylbenzamide to this nonionic polyacrylamide inverse emulsion, control the temperature at about 40°C, add 5ml of acetic acid dropwise, react for about 10h, and then slowly add 50% sodium hydroxide aqueous solution 6.6 ml neutralized to prepare a hydrophobically modified nonionic polyacrylamide inverse emulsion. ...

Embodiment 2

[0015] In a 500ml four-neck flask with a stirrer, thermometer, condenser and gas inlet and outlet, add 60g of 43wt% acrylamide aqueous solution, 10g of emulsifier sorbitan monolaurate and 2.5g of octylphenol polyoxyethylene ether After stirring for 10 min, 25 g of 2-acrylamido-2-methylpropanesulfonic acid was added, and the pH value of the system was adjusted to 5.0 with 15% aqueous sodium hydroxide solution. After stirring for 20 minutes, add 100 ml of cyclohexane, control the temperature of the water bath at 25°C and stir for 30 minutes, while passing high-purity nitrogen to remove oxygen in the system. 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 until the highest temperature is raised to 60 ° C for 1 hour to prepare an anionic polyacrylamide inverse emulsion. Add 5g of n-methylolphthalimide to this anionic polyacrylamide inverse emulsion, control the temperature at about 40°C, add 3ml...

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Abstract

The invention belongs to the field of water-soluble macromolecular materials, and particularly relates to a preparation method of hydrophobic modified polyacrylamide. Hydrophobic modified polyacrylamide inverse emulsion is prepared by adopting acrylamide and 2-acrylamido-2-methylpropanesulfonic acid as monomers, adopting sorbitan mono-laurate and octaphenyl polyoxyethylene as emulsifiers, adopting kerosene or cyclohexane as an oil phase, preparing polyacrylamide inverse emulsion by virtue of chemical initiation or ultraviolet illumination, and adding a hydrophobic modification reagent containing a benzene ring into the inverse emulsion to perform the modification. The polyacrylamide inverse emulsion is hydrophobically modified, and the hydrophobic group containing the benzene ring is introduced, so that not only can the viscosity of the polyacrylamide be remarkably improved, but also the temperature resistance and salt resistance of the polyacrylamide are greatly improved. A product prepared by the method is convenient to use, low-cost, and has high in application prospect, and industrialized production is easy.

Description

technical field [0001] The invention relates to the field of water-soluble polymer materials, in particular to a preparation method of hydrophobically modified polyacrylamide. Background technique [0002] At present, water-soluble polyacrylamide, which is widely used in China, has achieved good results in oil displacement operations in low-temperature and low-salt oilfields. However, when used in high-temperature and high-salt environments, the viscosity of polyacrylamide solution is severely lost, and the oil displacement effect becomes poor. Therefore, it is necessary to improve the temperature and salt resistance of polyacrylamide products. Polyacrylamide introduces a small amount of temperature-resistant and salt-resistant hydrophobic groups on the polyacrylamide chain segment through chemical modification. The hydrophobic or associative characteristics of the hydrophobic groups in the aqueous solution system make the long-chain chain of polyacrylamide in the aqueous so...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F120/56C08F8/30C08F2/32
CPCC08F2/32C08F8/30C08F120/06C08F220/56C08F120/56C08F220/585
Inventor 赵芳秦绪平
Owner SHANDONG UNIV
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