### Effects of radiation synthesis conditions on swelling properties of super water-absorbent poly(acrylic acid) for medical use

SU Chun()

1. Wujiang Dasheng Detection Technology Co. , Ltd, Suzhou 215214, China
• Received:2019-12-19 Revised:2020-02-28 Accepted:2020-02-28 Online:2020-06-20 Published:2020-06-18
• About author:SU Chun (male) was born in January 1984, and obtained his bachelor’s degree from Soochow University in June 2007, engaging in sterilization verification and modification by electron beam irradiation technology, sterilization validation engineer. E-mail: suchun@cgndasheng.com

Abstract:

The concept of radiation synthesis, its advantages and disadvantages compared with traditional polymer synthesis, the water absorption mechanism and swelling properties of super-absorbent resin (SAR) were introduced. There were many synthesis conditions that needed to be controlled, such as neutralization degree, absorption dose, and crosslinker dosage. Their influences on the swelling properties of poly(acrylic acid), super water-absorbent for medical use, were discussed in detail. In order to maximize the swelling properties, an electron beam radiation synthesis of high-performance, water-absorbent resin was designed. The uniform mixture was added into the atomization equipment, where mist droplets were polymerized through the ray curtain of the electron beam, to create gel particles. Surface crosslinking and sieving were subsequently carried out to form the water-absorbent resin. The effects of the absorption dose, the raw material, and dosage of the polymerization reaction on the swelling performance of SAR were studied. Absorbent resin product (2 g) was added into 50 mL of 0.9% NaCl solution and stirred at the speed of 600 r/min for 20 s; the time from the beginning of adding absorbent resin to the disappearance of the vortex was recorded as the absorption time. Regardless of the different polymerizing monomers, co-monomers, cross-linking agents, additives and surface cross-linking agents selected, the results showed that when the neutralization degree was around 65%~80% and the absorption dose was around 1~5 kGy, the absorption ratio of 0.9% NaCl solution to the absorbent resin product was about 70 g/g.

CLC Number:

• TL13