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Preparation method of ultra-high molecular weight cationic polyacrylamide

A polyacrylamide and ultra-high molecular weight technology, which is applied in the field of preparation of ultra-high molecular weight cationic polyacrylamide, can solve problems such as unavailability, and achieve the effects of high initiation efficiency, high molecular weight and stable polymerization reaction.

Active Publication Date: 2013-01-09
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot obtain products with a molecular weight of more than 25 million
As disclosed in CN1824682A, in the polymerization of the mixed aqueous solution of acrylamide and cationic monomers, a ternary composite initiator is used, and an azo initiator such as azobisisobutyronitrile is added before the reaction, and the temperature of the system is controlled at 10-40°C before adding Redox initiators, various additives, adiabatic polymerization, and products with a molecular weight of up to 25 million have not yet been obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 63.8g of deionized water into the polymerization container, add 160.4g of 30% acrylamide, 25.8g of 80% acryloyloxyethyltrimethylammonium chloride, 1.2g of co-solvent, and then add glacial acetic acid to adjust the system under stirring When the pH value reaches 6-7, nitrogen gas is introduced to remove the dissolved oxygen in the reaction system. At the same time, the system trigger temperature is adjusted to 15°C. After 15 minutes of nitrogen gas, 0.0082 g of azobisisobutylamidine hydrochloride and 0.0225 g of sodium formate are added, about After 5 minutes, the polymerization system starts to become viscous, and starts to heat up. After 1.5 hours, the temperature of the polymerization system reaches 50°C, put it in a 90°C oven for a certain period of time, and then granulate, dry, and crush to obtain cationic polyacrylamide with a molecular weight of 27.8 million. (CPAM).

Embodiment 2～ Embodiment 3

[0039] According to the method and steps of Example 1, the difference from Example 1 is that the initial temperature of the system in Example 2 is 5°C, and the molecular weight of the obtained CPAM is 28 million; the initial temperature of the system in Example 3 is 30°C, and the obtained CPAM The molecular weight is 25.05 million.

Embodiment 4～ Embodiment 6

[0041] According to the method and steps of Example 1, the difference with Example 1 is: the initiator add-on of Example 4 is 0.003g, and the molecular weight of gained CPAM is 28.21 million; the initiator add-on of Example 5 is 0.007g, and the gained CPAM The molecular weight of CPAM is 26.18 million; the initiator add-on of embodiment 6 is that the molecular weight of 0.01g gained CPAM is 25.03 million.

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Abstract

The invention relates to a preparation method of ultra-high molecular weight cationic polyacrylamide, which belongs to the acrylamide aqueous solution polymerization technical process. The method is characterized in that a cation monomer is acryloyloxyethyl trimethyl ammonium chloride or methacryloyloxyethyl trimethyl ammonium chloride, the amount of the cation monomer accounts for 5-60% of mass of the mixed monomer; an single azoamidine compound initiator is used, the amount of the azoamidine compound initiator accounts for 0.005-0.035% of the monomer mass; initiation is carried out at low temperature, thermal insulating polymerization is carried out, and the initiation temperature is 5-30 DEG C; a cosolvent, a chain transferring agent and addition of the cosolvent account for 2-5% of monomer mass, the addition of the chain transferring agent accounts for 0.01-0.07% of monomer mass, the pH value is adjusted to 6-7, and nitrogen is introduced for removing oxygen for polymerization. The preparation method of ultra-high molecular weight cationic polyacrylamide can prepare the product with relative molecular weight greater than or equal to 25,000,000. The dissolvability is good, the ultra-high molecular weight cationic polyacrylamide accords with the industrial standard, and is easy for large-scale industrial production, and the method can be widely used for the industries of tertiary oil extraction, sewage processing, papermaking, weaving, printing and dyeing and the like.

Description

technical field [0001] The invention is a preparation method of ultrahigh molecular weight cationic polyacrylamide. It belongs to the acrylamide aqueous solution polymerization process. Background technique [0002] Water-soluble high polymer cationic polyacrylamide product with excellent performance is used as flocculant in water treatment industry, and widely used as oil displacement aid in oil development and tertiary oil recovery operations. And the consumption is increasing year by year, which has a good development prospect. [0003] Polyacrylamide is used as a flocculant in the water treatment industry and a three-time oil displacement aid, and its relative molecular weight is an important technical indicator. The higher the relative molecular weight of polyacrylamide, the better the flocculation and oil displacement effect. Therefore, increasing the relative molecular weight of cationic polyacrylamide has always been the unremitting goal of polyacrylamide producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F4/04C08F2/10
Inventor 张勇郭卫东李留忠袁锦慧于永玲梁斌张磊张立红鲍春伟车万里朱卫东
Owner CHINA PETROLEUM & CHEM CORP
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