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Water soluble amphoteric ion copolymer and preparation process thereof

A technology of amphoteric ions and copolymers, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of less binary copolymerization, and achieve good water solubility and good viscosity-increasing effects

Inactive Publication Date: 2006-11-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It has been reported: AM / methacryloyloxyethyltrimethylammonium chloride / AMPS inverse emulsion polymerization (Shen Yinghua, Xie Long, Wang Zhizhong. Acta Polymerica Sinica, 2005, (6): 846-850); MOTAC / AA / AM aqueous solution polymerization (Wang Zhonghua. Oilfield Chemistry, 1996, 13 (4): 369 ~ 370), (AM / AA / DADMAC) copolymer water plugging agent preparation of inverse emulsion method (Zhao Yong, Li Weiyun, Ha Runhua et al. Fine Chemicals. 1997, 14(6): 35~37); Synthesis and properties of AMPS / HMOPTA / AM copolymer fluid loss reducer (Liu Minghua, Zhou Lequn, Yang Xiaohua. Progress in Fine Petrochemicals. 2005, 6( 3): 24~27), etc. In recent years, domestic and foreign scholars have mainly focused on the binary or ternary copolymerization of acrylamide monomers, and there are few studies on the binary copolymerization of cationic and anionic monomers.

Method used

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  • Water soluble amphoteric ion copolymer and preparation process thereof
  • Water soluble amphoteric ion copolymer and preparation process thereof
  • Water soluble amphoteric ion copolymer and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A

[0026] Example 1 Synthesis of AMPS / DMC zwitterionic polymer

[0027] Formula-1: (1). Oil phase: Dissolve emulsifiers Span80 and Tween60 in kerosene at a mass ratio of 5:1, emulsifiers account for 6% of kerosene by mass; (2). Water phase: mix 2- Methyl-2-acrylamidopropanesulfonic acid (AMPS) and methacryloxyethyl trimethylammonium chloride (DMC) are weighed at a mass ratio of 6.7:1, dissolved in distilled water to prepare a monomer aqueous solution , Adjust its pH to 7, and the total mass fraction of monomers to 55%; (3) Mix and stir the oil phase and the water phase at 1:2.3 to make a white emulsion, transfer the emulsion to a 250mL three-necked flask, Nitrogen, adjust the temperature of the water bath to 45℃, add 0.6% of the total monomer mass (NH 4 ) 2 S 2 O 8 -Na 2 SO 3 The oxidation-reduction initiator is placed in a constant temperature water bath and stirred for 6 hours to form a slightly pink viscous emulsion, which is a polymerization product; the specific dosage of formul...

Embodiment 2A

[0031] Example 2 AMPS / DMC zwitterionic polymer acid solution viscosity increase

[0032] see figure 1 The acid solution is 20% HCl. With the increase in the amount of the experimental formula-1 copolymer, the viscosity of the polymer in the acid solution increases, indicating that the copolymer has good viscosity increasing properties as a thickening agent in the acid solution.

Embodiment 3A

[0033] Example 3 Thermal stability of AMPS / DMC zwitterionic polymer in acid solution

[0034] Add 3% mass fraction of experimental formula-1 copolymer to 20% HCl to prepare 3% thickened acid, see figure 2 The apparent viscosity of the thickened acid solution decreases slowly from 30°C to 90°C, indicating that AMPS / DMC zwitterionic copolymer as a thickening agent has good thermal stability in the acid solution.

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Abstract

A water-soluble zwitterionic copolymer contains two structure units: 2-methyl-2- acrylamido propanesulfonic acid and methyl acrylyloxyethyl trimethyl ammonium chloride. Its preparing process includes such steps as proportionally adding the anhydrate sorbitol monooleate and the anhydrated sorbitol monostearate to kerosene, proportionally dissolving two monomers in water and regulating its pH=7, proportionally mixing oil phase with water phase, filling N2, adding redox trigger, and redox reaction in constant-temp water bath.

Description

Technical field [0001] The invention relates to a zwitterionic copolymer and a preparation method thereof. Background technique [0002] Zwitterionic polymer is a new type of polymer chemical agent. Because of its unique molecular structure and good application performance, it has been widely used in the petroleum industry in recent years. It has certain aspects in drilling fluid treatment agents, fracturing fluid additives, cement admixtures, and enhanced oil recovery chemicals. The application has great potential for development. [0003] Monoteric polyelectrolyte has excellent viscosity-increasing ability, but poor salt resistance. The viscosity of amphoteric polymer gradually increases with the release of polymer molecular coils from small molecular salts. Zwitterionic polymer has both good viscosity-increasing and salt resistance. , Greatly play the role of high molecular polymers. The current synthesis methods of zwitterions include homogeneous polymerization and heterogene...

Claims

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Application Information

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IPC IPC(8): C08F220/60C08F2/24C08F220/58C09K8/00
Inventor 陈馥徐东梅刘彝刘徐慧
Owner SOUTHWEST PETROLEUM UNIV
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