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Preparation method of star polyacrylamide polymer

A technology of polyacrylamide and acrylamide, which is applied in the field of preparation of star-shaped acrylamide polymers, can solve the problems of small molecular weight, unfavorable industrial production, and impracticality, etc. The effect of strong shear performance

Active Publication Date: 2012-01-18
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent CN1594369, a dendritic thioxanthone photoinitiator was obtained after modifying polypropylene imine, and a dendritic star-shaped polypropylene was prepared in a mixed solvent of water and dimethyl sulfoxide by photoinitiated free radical polymerization. Amide, but due to the poor water solubility of the modified dendritic thioxanthone photoinitiator, the reaction is carried out in a mixed solvent, and the product has a small molecular weight and is not practical
In addition, the raw material polypropyleneimine used in the initiator has no industrial products at present, and the cost is high, which is not conducive to industrial production.

Method used

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  • Preparation method of star polyacrylamide polymer
  • Preparation method of star polyacrylamide polymer
  • Preparation method of star polyacrylamide polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Preparation of thioxanthone-modified polyethyleneimine shown in embodiment 1, formula (II)

[0047] (1) Preparation of 2-glycidyloxythioxanthone

[0048] Dissolve 16g of thiosalicylic acid in 150mL of concentrated sulfuric acid, stir at room temperature for 10min; slowly add 44g of phenol dropwise, react at room temperature for 1h, then raise the temperature to 80°C for 2h, and let stand overnight. Slowly pour the reaction solution into 1500mL boiling water, and continue to boil for 30 minutes after adding; cool to about 60°C and filter, dry to obtain the intermediate product 2-hydroxythioxanthone. Add 13.68g of 2-hydroxythioxanthone, 21g of anhydrous potassium carbonate, and 100mL of epichlorohydrin into 120mL of toluene, react at 80°C for 12h, then react at 135°C for 12h, filter after the reaction is complete, and spin dry Excess epichlorohydrin and solvent were used, and the residue was extracted with chloroform to obtain 80.5 g of 2-glycidoxythioxanthone.

[0049]...

Embodiment 2

[0056] Embodiment 2, the preparation of star acrylamide homopolymer

[0057] Prepare 100mL of acrylamide aqueous solution with a mass fraction of 30% (containing 30g of acrylamide), pour the reaction solution into a rectangular quartz glass tank (150×90×40mm), add thioxanthone-modified polyethyleneimine (TX- PEI1800) 0.0027g, the concentration of thioxanthone modified polyethyleneimine (TX-PEI1800) is 15×10 -6 mol / L, nitrogen and deoxygenation for 30 minutes, seal the glass tank and place it 15cm above the 500W high-pressure mercury lamp. At this time, the ultraviolet rays pass through the filter ZJB360 and irradiate the reaction solution, and react at 30°C for 30 minutes to obtain star-shaped polyacrylamide The block of homopolymer, shredded, precipitated with absolute ethanol, and dried to obtain star-shaped polyacrylamide homopolymer (PEI1800-PAM) with thioxanthone-modified polyethyleneimine as the core, the reaction conversion rate is 99.6%, its GPC curve as Figure 4 sh...

Embodiment 3

[0060] Embodiment 3, preparation of partially hydrolyzed star polyacrylamide homopolymer

[0061] Prepare 100mL of acrylamide aqueous solution with a mass fraction of 25% (containing 25g of acrylamide), pour the reaction solution into a rectangular quartz glass tank (150×90×40mm), add thioxanthone-modified polyethyleneimine (TX- PEI1800) 0.0018g, the concentration of thioxanthone modified polyethyleneimine (TX-PEI1800) is 10×10 -6 mol / L, nitrogen and deoxygenation for 30 minutes, seal the glass tank and place it 10cm above the 500W high-pressure mercury lamp. At this time, the ultraviolet rays pass through the filter ZJB360 and irradiate the reaction solution, and react at 30°C for 30 minutes to obtain star-shaped polyacrylamide Homopolymer block, cut into pieces, added 70mL of 10wt% NaOH solution, hydrolyzed at 90°C for 3h, precipitated with absolute ethanol, and dried to obtain partially hydrolyzed star polymer with thioxanthone-modified polyethyleneimine as the core. Acryl...

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Abstract

The invention discloses a preparation method of a star polyacrylamide polymer taking polymine as a core. The method comprises the following step of: initiating a polymerization reaction of an aqueous solution of acrylamide or a mixed aqueous solution of acrylamide and a comonomer by using thioxanthone-modified polymine shown as a formula (II) under illumination to obtain a product, wherein the molar ratio of the comonomer to the polymine is 0.3-0.6 percent; a core A is the thioxanthone-modified polymine shown as the formula (II); the polymerization degree N is 1-16; and an arm B is an acrylamide homopolymer or a copolymer formed by acrylamide and a comonomer. In the invention, the polymerization reaction is fully undergone in water, so that operation is easy, the using amount of an initiator is small, and the reaction speed is low. The polymer has the advantages of large molecular weight, high shearing resistance and practicability.

Description

technical field [0001] The invention relates to a preparation method of a star-shaped acrylamide polymer, in particular to a preparation method of a star-shaped acrylamide polymer with polyethyleneimine as the core. Background technique [0002] When polymers are used in oilfield flooding, mechanical shear degradation often occurs during their formulation (stirrers), transport (pipeline components, pumps, valves), injection (casing boreholes), and flow through interstitial media, resulting in polymeric The viscosity of the product solution decreases, sometimes even by 60-70%. Changing the structure of the polymer can effectively improve the mechanical shear resistance of the polymer. It is introduced in US Patent 4620048 that the shear resistance of the branched star polymer is obviously better than that of the linear polymer. At present, the common methods for synthesizing star polymers include atom transfer radical polymerization, reversible addition-fragmentation chain t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/56C08F2/48C08G73/04
Inventor 张健段明方申文
Owner CHINA NAT OFFSHORE OIL CORP
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