Method of preparing polyacrylate super absorbent resin at high temperature

Abstract

The invention discloses a method of preparing polyacrylate super absorbent resin at a high temperature. The method comprises the following steps: adding a sodium hydroxide solution (50%) into an acrylic acid solution with a certain concentration to carry out neutralization reactions so as to obtain a neutral solution; when the temperature of the neutral solution is 50-90 DEG C, adding a crosslinking agent and other auxiliary agents into the neutral solution according to a certain ratio, carrying out reactions to obtain gel, wherein the final temperature of gelling reactions can reach 100-160 DEG C; grinding and extruding gel, drying, grinding, sieving, and finally carrying out secondary surface crosslinking to prepare the polyacrylate super absorbent resin. The heat of neutralization reactions is utilized, a crosslinking agent is added at a high temperature to carry out reactions, the energy consumption for cooling is reduced, and continuous production is guaranteed. Because the primary temperature of polymerization is high, the highest temperature of gelling reactions is high, a large amount of water is removed through evaporation, drying is promoted; the reaction time is short, the production efficiency is largely improved, the steps of nitrogen introducing and oxygen removing are not needed, and the production cost is reduced therefore.

Description

technical field [0001] The invention relates to a preparation method of polyacrylate superabsorbent resin, in particular to a method for preparing polyacrylate superabsorbent resin at high temperature. Background technique [0002] Polyacrylate superabsorbent resin is a high polymer with a certain crosslinking strength. It has strong water absorption capacity and can quickly absorb water hundreds or even thousands of times its own weight, and it will not flow out after absorption, even under a certain pressure. It can still retain moisture without being separated. It is precisely because of its excellent water absorption, water retention and good biodegradability that it is widely used in many aspects such as diapers, sanitary napkins, food preservatives, agricultural and forestry soil drought resistance and water retention agents, sand prevention and water control, etc. It is a kind of product with good market prospects The product. [0003] The existing patent applicatio...

AI Technical Summary

Problems solved by technology

The neutralization reaction of acrylic acid and sodium hydroxide solution is a violent exothermic reaction, and the temperature of the neutralizing solution can reach up to about 90°C. If the initiator is added to react at a lower temperature, it is necessary to turn on the ice machine to cool down, so that not only It affects the continuity of on-site production and wastes a lot of energy. In addition, nitrogen and oxygen removal need to consume a lot of nitrogen, which also increases production costs.