Water-soluble hydrophobic associated copolymer and preparation thereof

Abstract

The invention discloses a water soluble hydrophobic associating polymer and a preparation method thereof. The water soluble hydrophobic associating polymer obtained through the method of the invention has good water solubility and aqueous medium thickening property, and still has a very good thickening effect under a high temperature and a high shear rate. The polymer molecules take a similar comb-like structure, have a more excellent salt-resistant ability, and can be widely applied in the field of petrochemical industry, and in particualr the polymer molecules can be used as the displacement agent for tertiary oil recovery in the oilfield.

Description

technical field [0001] The invention relates to a water-soluble hydrophobic association copolymer and a preparation method, and belongs to the field of synthesis of polymer materials. Background technique [0002] The increase of the viscosity of the aqueous solution is usually achieved by adding water-soluble polymers to the water. At present, these water-soluble polymers are mainly acrylamide series products, certain biochemical polymers (such as xanthan gum, squash gum, etc.) and their derivatives. ("Oilfield Chemicals" edited by Zheng Xiaoyu and Wu Zhaoliang, Chemical Industry Press, 2001.5). These traditional polymers mainly rely on stretching and physical entanglement of polymer chains to increase viscosity. In order to meet the performance requirements of acrylamide in tertiary oil recovery and water treatment, the molecular weight of acrylamide is also required to be higher and higher, from the usual several million to tens of millions. These high-molecular-weight ...

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Problems solved by technology

After these monomers with long alkyl chains are copolymerized into the polymer, it seriously affects the solubility of the polymer.

The dissolution time of this type of polymer is greatly prolonged, and even the phenomenon of uneven concentration or incompletely dissolved "fish eyes" may appear in the solution

[0007] In summary, although a lot of work has been done on the modification and stabilization of polyacrylamide, and fruitful results have been achieved in many fields, due to the following reasons: (A). Modified hydrophobically associating copolymers The performance can be greatly improved in some aspects, but other performances are damaged because of this, and they often lose sight of the other; b. The synthesis process of most modified hydrophobic monomers is cumbersome and expensive, which brings difficulties to large-scale industrial production. It has no practical significance to be applied in oilfield exploitation

Therefore, the synthesis of inexpensive, well-performing hydrophobic copolymers remains a formidable challenge.

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