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Preparation method and application of temperature-resistant and salt-resistant six-arm star-shaped polyacrylamide

A polyacrylamide, temperature-resistant and salt-resistant technology, used in chemical instruments and methods, drilling compositions, etc., can solve the problems of unstable molecular chain structure, decreased viscosity and viscoelasticity, and easy entanglement of molecular chains. , to achieve good solubility, avoid curling, and high regional crosslink density

Active Publication Date: 2021-11-02
ANHUI TIANRUN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, ultra-high molecular weight hydrolyzed polyacrylamide and hydrophobically modified polyacrylamide are the main research and application directions of heat-resistant and salt-resistant polyacrylamide. High-molecular-weight polyacrylamide generally has a linear linear chain structure, and its molecular chain structure is unstable and its shear resistance is poor. The viscoelasticity drops sharply, and the linear linear polymer still has the problems of difficulty in dissolution, long molecular chain, and excessive size

Method used

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  • Preparation method and application of temperature-resistant and salt-resistant six-arm star-shaped polyacrylamide
  • Preparation method and application of temperature-resistant and salt-resistant six-arm star-shaped polyacrylamide
  • Preparation method and application of temperature-resistant and salt-resistant six-arm star-shaped polyacrylamide

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preparation example Construction

[0034] This example provides a method for preparing a temperature-resistant and salt-resistant six-arm star-shaped polyacrylamide. The six-arm star-shaped polyacrylamide uses hexa(p-aminophenoxy)-cyclotriphosphazene as a rigid structural core, and Ring-opening addition reaction with unsaturated monomers containing epoxy group, acylation reaction with unsaturated monomers containing acid or anhydride, and then with acrylamide, 2-acrylamido-2-methylpropanesulfonic acid , hydrophobic monomers are copolymerized, specifically comprising the following steps:

[0035] (1) Preparation of materials: Weigh 8 to 10 parts of hexa(p-aminophenoxy)-cyclotriphosphazene, 6 to 10 parts of unsaturated monomers containing epoxy groups, unsaturated mono 4-6 parts of N,N-dimethylformamide, 80-100 parts of N,N-dimethylformamide, 0.3-0.5 parts of EDC·HCl, 40-50 parts of acrylamide, 120 parts of 2-acrylamido-2-methylpropanesulfonic acid ~135 parts, 160~180 parts of deionized water, 2~4 parts of hydro...

Embodiment 1

[0047] (1) Material preparation: Weigh 8 g of hexa(p-aminophenoxy)-cyclotriphosphazene, 6 g of allyl glycidyl ether, 5 g of itaconic acid, 90 g of N,N-dimethylformamide, 0.5 g of EDC·HCl g, 45g of acrylamide, 130g of 2-acrylamido-2-methylpropanesulfonic acid, 165g of deionized water, 2.5g of hexadecyldimethylallyl ammonium chloride, 10g of compound initiator solution, caustic soda 50g; the composite is made up of the following components in mass percentage: (a) 0.1% potassium persulfate; (b) 0.1% sodium sulfite; (c) 0.15% azobisisobutyronitrile; (d) 0.1% N, N-dimethylaminoethyl methacrylate; (e) 0.1% ethylenediamine; (f) 0.4% isopropanol; (g) 0.5% urea; (h) deionized water to make up the remaining quantity;

[0048] (2) Preparation of polymerization solution:

[0049] i. Add hexa(p-aminophenoxy)-cyclotriphosphazene and allyl glycidyl ether into N,N-dimethylformamide, stir and dissolve at 50°C to obtain solution I;

[0050] ii. Dissolve itaconic acid, N,N-dimethylformamide, ...

Embodiment 2

[0056] Same as Example 1, except that 6g of allyl glycidyl ether is replaced by 6g of 4-vinylbenzyl glycidyl ether.

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Abstract

The invention discloses a preparation method and application of temperature-resistant and salt-resistant six-arm star-shaped polyacrylamide. Hexa(p-aminophenoxy)-cyclotriphosphazene is used as a rigid structure mother nucleus and is reacted with an unsaturated monomer containing epoxy groups and an unsaturated monomer of acid or anhydride in advance; under the action of a composite initiator, copolymerization is carried out with acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and a hydrophobic monomer by using -C = C-; and a post-hydrolysis process is performed to obtain the six-arm star-shaped polyacrylamide product. The polyacrylamide product has enough high molecular weight, can show relatively high apparent viscosity and shear resistance in an oil displacement process, has good solubility, can meet the harsh requirements of high temperature, high salt and low permeability of an oil reservoir, and can play an important role in tertiary oil recovery of an oil field as a polymer flooding agent.

Description

technical field [0001] The invention belongs to, and specifically relates to a preparation method and application of a temperature-resistant and salt-resistant six-arm star-shaped polyacrylamide. Background technique [0002] At present, after primary and secondary oil recovery in oil fields, the water content of crude oil continues to increase, and many oil fields have entered the stage of tertiary oil recovery. In view of the characteristics of high reservoir temperature and salinity in tertiary oil recovery, in order to obtain ideal oil displacement effects, The polymer must have good viscosity-increasing ability and strong temperature resistance, salt resistance and shear resistance. The partial hydrolysis of polyacrylamide can effectively increase the viscosity of the displacement aqueous solution, improve the heterogeneity of the oil layer, and enhance the oil recovery, so it is widely used as a polymer flooding agent in tertiary oil recovery. However, hydrolyzed poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F230/02C08F226/02C08F220/56C09K8/588
CPCC08F220/585C09K8/588C08F230/02C08F226/02C08F220/56
Inventor 刘彭城李杰陈建波汪艳张传银乔磊磊张弓
Owner ANHUI TIANRUN CHEM CO LTD
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