Study On The Properties Of Maleinated Starch And Its Sulfonated Modification Using As Warp Size Agents

To explore the organic starch-ester which is suitable for synthetic fiber as warp sizingagent, and to solve the molecule structure defects of the native starch paste, as well as makeup for some deficiencies in the performance of the acetate starch paste, an attempt had beenmade by taking maleic anhydride as esterification agent to prepare a series of maleinatedstarch (MAS) with different degree of substitution (DS). The capability was preliminarydetermined by comparing with the industry commonly used acetate starch (AS) in terms ofthe starch paste viscosity, size films and adhesion to fibers. The behavious of MAS can alsobe improved through sulfonating to form sulfosuccinylated starch (SSS) by the replacementof the group of carbon double bond, and its properties was discussed under the same teststandards. In addition, this paper also studied the possibility of SSS to replace PVA size.Research results showed that, the viscosity of starch cooked paste and its thermalstability as well as the water dispersion ability were all improved by maleinated modification.In accordance with the mechanical behavior of film, maleic anhydride esterification canincrease the break elongation and work to break, as well as improve the toughness of thestarch film, and was superior to the similar degree of substitution of AS one according to thedata analysis. On the comprehensive considerations, the performance of size film is bestwhen the DS value of SSS is0.034. The analysis also shows that, however, maleic anhydrideesterification modification on the improvement of the starch size is not very significant whencompared with the acetate one.Sulfosuccinylated modification can obviously improve the adhesion of starch to fiberswith the increase of DS value. It was found that, the size performances of thesulfosuccinylated starch were more significant compared with maleinated one. It is necessaryto be maleinated, then through sulfonation modification of starch, when used as sizing agent.Moreover, there is no harmful to the environment of two kinds of modification, according tothe evaluation on biodegradation of starches. Considering on the viscosity, adhesion to fibers,and biodegradability, sulfosuccinylated modification is an effective way to improve starchadhesive, and adhesion behavior of starch reached a maximal at the DS value of0.032.The feasibility of SSS to substitute PVA, and to meet with the requirements of the warpsizing to synthetic fibers were also evaluated by contrasting with PVA and acid-thinned starch (ATS) blending size as a target object size. Experimental results showed that the performanceof the same proportion of PVA/SSS blend paste was obviously better than the target size.From the consideration on the blending of size film and adhesive to fibers, the PVA/SSSblend one got well comprehensive performance. Compared with the target proportion size,using SSS can not only reduce the consumption amount of PVA, but also reduce the cost andpollution to the environment.