Preparation And Research Of Superabsorbent Fiber

Superabsorbent fiber is a kind of functional fiber based on superabsorbent polymer, which has wonderful water-absorbing and water-retaining ability, can maintain better strength and integrity after absorbing water, and can be processed easily. So it will be used widely in the future. Nowadays only a few developed countries can product superabsorbent fiber, and research on superabsorbent fiber is in the primary state in our country.Superabsorbent polymer was prepared by solution polymerization and spinned into fiber. The main content as follows:1. Effect of PVA, viscidity on the spinnability was studied and effect of surface active agent on viscidity was also studied. The results showed that spinnability was greatly improved by PVA, 20% of monomer was the best content. When the viscidity of spinning solution was 30000mpa.s, the spinnability was best. The viscidity reduced by increasing surface agent, and the adjustment was ideal.2. Effect of some factors on absorbency was investigated. The absorbency increased first and reduced then as the content of AM increased, it got the maximize when the content was 25% of monomer. The absorbency increased as the neutralization value increased, and attained the maximize when the neutralization value was 75%, after this point, the absorbency descent. The absorbency increased first, then decreased as the content of initiator increased, the absorbency was best when the content was 3%. The absorbency reduced by increasing PVA, we choose the content of PVA as 20%, because the spinnability increased by increasing PVA. When cross-linking time became long, the absorbency increased first and decreased then. 20min on 130 C was an adaptable cross-linking time. According to these conditions, the absorbency of H2O could get 320g/g, and the absorbency of 0.9% NaCL solution could get 50g/g.3.Absorbent velocity ,heat stability and mechanical property were studied, compared with superabsorbent polymer , the superabsorbent fiber had betterabsorbent velocity , and could absorb 100g /g H2O within 2 min. Heat stability was good on 50 C .As the absorbency increased, break strength fell and extension at break increased.4.The structure of superabsorbent fiber was studied DSC and SEM. DSC showed there were two glass transitions and phase interface came into being in the superabsorbent fiber. SEM showed there were a great deal of micropores in the superabsorbent fiber whose size varied from 1 m to 20 m, and there were a lot of dents whose size was about 10 m, which could improved the absorbency.