Preparation method and preparation device for polyacrylamide nanoparticles

Abstract

The invention discloses a preparation method and a preparation device for polyacrylamide nanoparticles. The preparation method includes continuously introducing a liquid material, comprising acrylamide, crosslinking agents and initiators, and compressed air into a tubular reactor to decompose the initiators at a certain temperature to obtain free radicals, initiating polymerization of the acrylamide, guiding out a polyacrylamide-containing material from the tubular reactor, and collecting finished products of the polyacrylamide nanoparticles. The preparation method and the preparation device have the advantages that the process is simple, the high-safety tubular reactor is applied to continuous production, the prepared polyacrylamide nanoparticles have stable quality and uniform grain diameter, overflowing and colliding in a conventional kettle-type production process are avoided, and product quality and production efficiency are improved.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a preparation method and device of polyacrylamide nanometer microspheres. Background technique [0002] Polyacrylamide nano-microspheres are nano-particle polymers with a spatial network structure prepared under the condition of adding a small amount of cross-linking agent with microemulsion as the dispersion system and acrylamide as the monomer. After these particles are injected into the formation, the particle size is small, the viscosity of the aqueous solution is low, and it is easy to enter the deep part of the formation, and then expand by absorbing water, and the volume increases, so it can block the dominant channel of water flow in the formation and increase the sweep coefficient of injected water. Using polyacrylamide nano-microspheres for deep water control and flooding has positive effects on water control and oil stabilization in old reservoirs and impr...

AI Technical Summary

Problems solved by technology

This patent still requires a kettle reaction, and the initiation system used is an oxidation-reduction double initiator. Therefore, it is necessary to pass through the nitrogen protection system before adding the oxidizing initiator. When adding the reducing initiator, high-speed shearing and stirring are required. Control the heating rate ≤ 2°C / min, with various operating procedures and strict operating requirements

[0004] In the traditional kettle-type production method, there are problems such as small heat transfer area, inaccurate temperature control, and wide particle size distribution caused by stirring space distribution during the polymerization reaction. The heat is uncontrollable, which leads to the phenomenon of violent polymerization, resulting in the failure of the reaction, the scrapping of the material, and even the accident of the material clumping into the shaft and the motor of the stirring rod being damaged.

In addition, because the material has a certain viscosity, it is easy to adhere to the surface of the reactor, and it is easy to partially self-polymerize under long-term heating conditions to form a viscous insoluble gel. If the impurity peels off, the product quality will decline. The inner surface of the kettle is easy to affect the heat transfer of the reaction, and it is more difficult to clean the equipment

Images