Synthesizing Quaternary Ammonium Starch And Property Studying Of Sizing And Desizing

Nowadays , in the textile field, starch, PVA, acrylic size are the three kinds of sizes and have great contribution for weaving . However ,the situation of three main kinds sizes of is changing as man is increasing protection for environment and is developing economy sustainable. Starch and acrylic sizes are growing up , but PVA is going down becauseit has pollution to environment .Quaternary ammonium starch is the important one and has good developing outlook . But ,at present, beingcompared with other modified starches ,it uses a little in the textil field .Because people have some questions about its property of desizing, mixture with PVA and so on . The paper researches the property of sizing , and is aimed at the property of desizing and mixture with PVA.Using wet-progress synthesizes low degree of substitution of quaternary ammonium starch and using half—dry process synthesizes high degree of substitution of quaternary ammonium starch by using 3 — Chloro — 2 — hydroxyproyltrimethylammonium chloride (HTA) as a quaternary ammonium cationic etherifying agent, not N—(3—chloro—2 hydroxyproyl) trimethylammonium chloride . During synthesizing , we will discuss some different facts that are between in using HTA and in using GTA . such as , the lye concentration before synthesizing, synthetic temperature and mixture temperature of lye and etherisation andso on . Attain the anticipant subject of using HTA synthesizing high DS of quaternary ammonium starch.The paper resolves the questions , people think that the property of desizing of quaternary ammonium starch is very difficult. By testing , get conclusion that starch can desize in the lye completely . But the property of desizing of quaternary ammonium starch is different and the time of desizing completely is different . with the increasing of DS, the time is from 2h to 5h . testify that the DS has a certain influence in the property of starch solving in the lye .The paper synthesizes quaternary ammonium starch . Different DS starches will mix with PVA according to certain proportion ,and observe their property of mixture . Test proves that they have good property of mixture .The paper synthesizes quaternary ammonium starch . Some studies on the property of sizing .such as , the DS of quaternary ammonium starch has some influences in sizing property , and so on . It meets request of new properties through repeatedly tests . that is to say ,it can have good sizing property in cotton and in polyester / cotton too . Enlarge the varieties of starch sizes .