Preparation method of high-diffusivity water-absorbent resin

Abstract

The invention discloses a preparation method of a high-diffusivity water-absorbent resin. The preparation method comprises the following steps: adding acrylic acid, a 50% sodium hydroxide solution, a compound cross-linker, sodium bicarbonate, ethanol, silicon dioxide and deionized water to a reactor, mixing evenly, and then introducing nitrogen for 20 min to remove oxygen; next, adding an initiator at a temperature within the range of 5-10 DEG C to initiate a polymerization reaction, terminating the reaction when the temperature stops rising, and preserving heat for 2 hours at a temperature above 80 DEG C, thereby obtaining polymeric colloid; pelleting the colloid to obtain resin particles and drying at 180 DEG C until the moisture content is lower than 3%; and finally, evenly spraying a surface treating fluid to the particles for surface treatment, and preserving heat at 180 DEG C for 40 minutes, thereby obtaining the product. According to the preparation method of the high-diffusivity water-absorbent resin, the resin particles are of a loose porous structure, numerous pore passages are formed inside the resin particles and the contact area is greatly increased, and therefore, the high-diffusivity water-absorbent resin has an instantaneous absorption effect; and the pore passages are in contact and connected in series with each other, and due to the capillary action, moisture can be transferred among the particles smoothly.

Description

technical field [0001] The invention relates to the field of functional polymer chemical additives, in particular to a preparation method of a highly diffusible water-absorbing resin. Background technique [0002] At present, polyacrylic acid accounts for 80% of the world's superabsorbent resin production. It is widely used in disposable diapers and hygiene products because of its super water absorption and water retention functions, and this application accounts for more than 70% of SAP demand. However, there are certain defects in this kind of products, for example, the diffusibility of liquid between particles is poor during absorption, which leads to low utilization rate of the water-absorbing resin in sanitary products and causes waste. At present, there are also studies and reports on the porosity of superabsorbent resins, such as Lei Guangcai et al. using the reversed phase suspension polymerization method (Lei Guangcai, Ding Lintong, etc. Formation and control of th...