CHARACERISTICS OF CATALYTIC OXIDIZED TAPIOCA STARCHES FOR ADHESIVES OF CORRUGATED BOARD
The starch adhesive (CY-0.5) prepared by catalytic oxidation of tapioca starch had a much higher solid content (29%), compared with 14% and 16% of starch adhesives (WC-2 and WC-8) made of catalytic oxidation of tapioca starch without catalyst. The adhesive strength of CY-0.5 was larger than these of WC-2 and WC-8 by 30%. The distribution of molecular weights of the oxidized starches was determined using a gel permeation chromatograph-multiple angle laser light scattering (GPC-MALLS) The results showed that the catalytic oxidized starches had a smaller distribution of molecular weights and was more wellproportioned than oxidized starches without catalyst. Catalytic oxidation increased greatly the carboxyl and carbonyl contents in CY-0.5. The larger amounts of carboxyl and carbonyl groups and more even fracture of starch molecules could contribute to high solid content and good fluidity of CY-0.5. The optimum conditions for the preparation of the adhesives were 0.5%～1% of the catalyst on the starch, 1.6%～2% of NaClO, 12% of NaOH, 2% of Na4S4O7·10H2O, and oxidation time 30min.
Wu Zonghua Chen Shaoping Chen Ying You Jiping
College of Chemistry and Materials, Fujian Normal University, Fuzhou, 350007, China
国际会议
广州
英文
412-416
2006-11-08（万方平台首次上网日期，不代表论文的发表时间）