阅读说明：本技术 高强度双网络水凝胶的制备方法 (Preparation method of high-strength double-network hydrogel ) 是由 吕斌 王浩 高党鸽 于 2019-10-22 设计创作，主要内容包括：本发明公开了一种高强度双网格水凝胶的制备方法,克服了现有水凝胶机械强度不足使其应用在石油堵剂领域受到限制的问题。本发明的技术方案为：将2-丙烯酰胺-2-甲基丙磺酸和丙烯酰胺经自由基聚合得到的第一网络水凝胶,将该水凝胶浸泡在含有丙烯酰胺单体的溶液中至溶胀平衡,取出含有丙烯酰胺单体溶液的第一网络水凝胶,反应数小时,即可得到高强度双网络水凝胶。本发明制得的双网络水凝胶具有优秀的力学性能,能够满足石油堵剂的强度要求。(The invention discloses a preparation method of high-strength double-grid hydrogel, which solves the problem that the application of the existing hydrogel in the field of petroleum plugging agents is limited due to insufficient mechanical strength. The technical scheme of the invention is as follows: and (2) carrying out free radical polymerization on 2-acrylamide-2-methylpropanesulfonic acid and acrylamide to obtain a first network hydrogel, soaking the hydrogel in a solution containing an acrylamide monomer until the hydrogel is in swelling balance, taking out the first network hydrogel containing the acrylamide monomer solution, and reacting for several hours to obtain the high-strength double-network hydrogel. The double-network hydrogel prepared by the invention has excellent mechanical properties and can meet the strength requirement of the petroleum plugging agent.)

1. A preparation method of high-strength double-network hydrogel is characterized by comprising the following steps:

the method comprises the steps of carrying out free radical polymerization on 2-acrylamide-2-methylpropanesulfonic acid AMPS and acrylamide AM to obtain a first network hydrogel, soaking the hydrogel in a solution containing an acrylamide AM monomer until swelling balance is achieved, taking out the first network hydrogel containing the acrylamide AM monomer solution, and carrying out reaction to obtain the high-strength double-network hydrogel.

2. The method of claim 1, wherein the high strength double network hydrogel comprises:

the method specifically comprises the following steps:

dissolving 2 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 0.06 part by weight of N, N-methylenebisacrylamide, 0.03 part by weight of potassium persulfate and 0.03 part by weight of acrylamide in 10 parts by weight of water, reacting for 3 hours at the temperature of 60 ℃, and taking out the formed first network hydrogel; and dissolving 15 parts by weight of acrylamide, 0.05 part by weight of potassium persulfate and 0.017 part by weight of potassium persulfate into 100 parts by weight of water to obtain a monomer solution, soaking the obtained first network hydrogel in the monomer solution until the first network hydrogel is in swelling balance, taking out the first network hydrogel after the swelling balance, and reacting for 3-9 hours at the temperature of 60 ℃ to obtain the high-strength double-network hydrogel.

Technical Field

The invention relates to a preparation method of high-strength double-network hydrogel.

Background

At present, most of the main oil fields in China enter the high-water content oil production period. Oil wells have increasing water content and have severely affected crude oil production, particularly in limestone fracture fields, and once water is found in an oil well, oil production drops dramatically. However, with the continuous development of oil fields and the complication of geological conditions of stratums, the plugging agent cannot completely meet the requirements, and a high-strength water plugging material is urgently needed to be found. (Tianhongkun, in Lihongkun, Shilixun. PR-8201 water shutoff agent and water shutoff technology [ J ] oil drilling and production technology, 1988(7): 75-82.).

The plugging agents are mainly divided into two categories, one is a non-selective plugging agent, and the other is a selective plugging agent. The selective water shutoff agents are classified into water-based ones, oil-based ones, alcohols, etc. The water-based paint has the characteristics of good environmental protection, low cost and the like, and is widely used. Hydrogels (hydrogels) are a class of water-based polymers, which are three-dimensional networks of hydrophilic high molecular polymers with chemically or physically cross-linked structures, and because of their hydrophilic cross-linked networks, hydrogels can absorb a large amount of water but are insoluble in water, and they can maintain a certain shape and three-dimensional spatial network structure in water and swell rapidly. Due to the special structures, the high-strength double-network hydrogel is expected to be applied to the field of petroleum blocking agents.

However, the mechanical strength of the conventional hydrogel is insufficient, so that the application of the conventional hydrogel to the field of petroleum blocking agents is limited, and researchers develop novel high-strength hydrogels, such as Topological (TP) hydrogel, double-network (DN) hydrogel, Macromolecular Microsphere Composite (MMC) hydrogel and the like. Among them, the fact that the double-network hydrogel exhibits extremely high strength and toughness due to the contrast of network structures and effective energy dissipation by fracture has been one of the hot spots of research on high-strength hydrogels. The first network structure and properties of the double-network hydrogel are important factors influencing the strength and toughness of the PAMPS/PAM double-network hydrogel.

Disclosure of Invention

The invention aims to provide a preparation method of a high-strength double-network hydrogel, and the double-network hydrogel prepared by the method has excellent mechanical properties.

In order to achieve the purpose, the invention adopts the technical scheme that:

a preparation method of a high-strength double-grid hydrogel comprises the following specific steps:

dissolving 2 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 0.06 part by weight of N, N-methylenebisacrylamide, 0.03 part by weight of potassium persulfate and 0.03 part by weight of acrylamide in 10 parts by weight of water, reacting for 3 hours at the temperature of 60 ℃, and taking out the formed first network hydrogel; and dissolving 15 parts by weight of acrylamide, 0.05 part by weight of potassium persulfate and 0.017 part by weight of potassium persulfate into 100 parts by weight of water to obtain a monomer solution, soaking the obtained first network hydrogel in the monomer solution until the first network hydrogel is in swelling balance, taking out the first network hydrogel after the swelling balance, and reacting for 3-9 hours at the temperature of 60 ℃ to obtain the high-strength double-network hydrogel.

According to the invention, the comonomer is introduced into the first network to change the structure of the first network of the double-network hydrogel, so that the mechanical property of the double-network hydrogel is improved, and the strength requirement of the petroleum plugging agent is met.

Drawings

FIG. 1 is a compressive stress-strain curve of the prepared double-network hydrogel.

Detailed Description

The invention will be further described with reference to specific examples: