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A kind of preparation method of polyacrylamide emulsion with high solid content

A polyacrylamide, high solid content technology, used in the field of emulsion preparation to achieve the effects of low viscosity, balanced heat dissipation, and avoidance of potential safety hazards

Active Publication Date: 2017-08-25
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the defects in the research of the above-mentioned polyacrylamide emulsion, solves the problem of heat dissipation during the preparation of high-solid-content anion, cation and non-ionic polyacrylamide emulsion, and provides a preparation method of high-solid-content polyacrylamide emulsion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 287 kg of acrylamide, 125 kg of acrylic acid, and 150 kg of deionized water into the brewing kettle, stir well, add a sodium hydroxide solution with a mass concentration of 50%, control the neutralization temperature below 20°C, and adjust the pH value to 5.5 to 6.5; add 250 kg of dearomatized solvent oil, 30 kg of emulsifier, and 600 g of azo initiator into the emulsification kettle, and stir evenly; add the prepared water phase into the emulsification kettle for high-speed shearing For emulsification, control the temperature of the system at 10-15°C. After the emulsification is completed, pass high-purity nitrogen to drive oxygen for 1 hour, keep stirring, and add a solution containing 200 grams of oxidant dropwise during the period. After passing nitrogen to remove oxygen, empty the circulating water bath and slowly drop Add reducing agent for 1 hour, stop dropping when the temperature rises to 40°C, and at the same time pass into a circulating water bath at 40°C,...

Embodiment 2

[0023] Add 72 kg of acrylamide, 290 kg of acrylic acid, and 31 kg of deionized water into the brewing kettle, stir well, add a sodium hydroxide solution with a mass concentration of 50%, control the neutralization temperature below 20°C, and adjust the pH value to 5.5 to 6.5; add 250 kg of dearomatized solvent oil, 30 kg of emulsifier, and 600 g of azo initiator into the emulsification kettle, and stir evenly; add the prepared water phase into the emulsification kettle for high-speed shearing For emulsification, control the temperature of the system at 10-15°C. After the emulsification is completed, pass high-purity nitrogen to drive oxygen for 1 hour, keep stirring, and add a solution containing 200 grams of oxidant dropwise during the period. After passing nitrogen to remove oxygen, empty the circulating water bath and slowly drop Add the reducing agent for 0.5 hours, stop dropping when the temperature rises to 40°C, and at the same time pass it into a circulating water bath ...

Embodiment 3

[0025] Add 450 kilograms of acrylamide and 250 kilograms of deionized water to the preparation kettle, and stir evenly; Put the prepared water phase into the emulsification kettle, carry out high-speed shear emulsification, control the system temperature at 10-15°C, after the emulsification is completed, pass high-purity nitrogen gas to drive oxygen for 1 hour, keep stirring, and add dropwise a solution containing 200 grams of oxidant during the emulsification , after passing nitrogen to remove oxygen, empty the circulating water bath, slowly add the reducing agent dropwise for 2 hours, stop the dropwise addition when the temperature rises to 40°C, and at the same time pass through the circulating water bath at 40°C, stop stirring, let it stand for 1 hour, when the temperature When the temperature rises to 50°C, empty the circulating water bath and start stirring at a slow speed. During this period, adjust the stirring speed to control the maximum temperature not to exceed 60°C...

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Abstract

The invention relates to a preparation method of a high-solid-content polyacrylamide emulsion. According to the preparation method, solvent naphtha with low viscosity and high carrying capacity is used to form a water-in-oil emulsion with high monomer concentration and ensure that oil-water separation, demulsification caking and other phenomena will not occur during the polymerization process; and by a low-temperature initiating and segment initiating technology, reaction time of each polymerization stage is adjusted according to ion type of the emulsion so as to obtain the high-solid-content polyacrylamide emulsion. The invention has the following beneficial effects: by the low-temperature initiating and segment initiating technology, the heat-dissipation problem during the preparation process of the high-solid-content emulsion is solved; corresponding process adjusting is carried out in allusion to cationic, anionic, nonionic and other emulsion types; and the preparation technology of multiple ionic types of emulsion meets application requirements of various industries such as water treatment, papermaking, oilfield exploitation and the like.

Description

[0001] Technical field: [0002] The invention relates to the field of emulsion preparation, in particular to a method for preparing polyacrylamide emulsion with high solid content. [0003] Background technique: [0004] Acrylamide is easy to polymerize to obtain ultra-high molecular weight polymers, which can be widely used in the fields of water treatment, papermaking, and oil field exploitation. However, the high-molecular-weight polyacrylamide solution has a high viscosity, which increases the difficulty of preparation, and the high-molecular-weight polyacrylamide solid easily absorbs moisture and is difficult to dissolve, which also brings inconvenience during use. In order to solve this problem, a new polymerization method, inverse emulsion polymerization, appeared in the 1980s. This method obtains a thermally stable emulsion by greatly increasing the concentration of the emulsifier. However, due to the harsh conditions for its formation, the inverse emulsion product ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F2/32C08F4/40C08F120/56C08F220/34
Inventor 滕大勇滕厚开周立山牛心蕙徐俊英宋晓莉
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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