Research On The Performances Of The SiO₂ Nanoparticles/Starch Sizing

Sizing was the mainly used in the field of manufacturing process about the fibres and yarns. Starch had better film forming ability and good adhesion property to the natural fibre. But the sizing performance of starch was not very satisfactory, the film was hard and brittle, and gradually unable to meet the requirements of high-speed looms. The content of this research was that dispersed the SiO₂ Nanoparticles powder with different quality fraction through a certain technics, made into different proportion of SiO₂ Nanoparticles water-based suspension, to replace the water used to size mixing, then added quantitative starch, after mixing, boiling, made of different proportion of the SiO₂ Nanoparticles/starch sizing, then slashed different kinds of yarns.Tested the sizing percentage,moisture regain rate and tensile stretch rate of the yarns to certificate the parameters′reasonableness of the sizing process. Then tested the strength,abrasive resistance,hairiness,flexibility about mechanical and surface properties of different varieties of the yarns, compared sizing performances of different proportion, and obtained that when the content of the SiO₂ Nanoparticles was 3 to 4%, the slashed yarns achieved the best indicators.Making use of precision instruments to certificate mechanism of the SiO₂ Nanoparticles modified the starch sizing performance. Such as: made sizing skiving, calculated integrity and penetration rate, the surface microscopic view of the slashed yarns obtained by Scanning Electronic Microscope and High Magnification Optical Microscope;used infra-red spectrum to analyze the combination among the cotton fiber macromolecules,starch macromolecules and SiO₂ Nanoparticles. Gained different effects of the SiO₂ Nanoparticles on the natural fibre and chemical fibre By TGA. The study showed that, by adding SiO₂ Nanoparticles, because its surface had rich hydroxide radical (—OH) ,the starch and cotton fibre macromolecules also had hydroxide radical, among them there existed a strong hydrogen bonding, increased bonding force of the glycosides key that links the cotton fibre macromolecules. Due to the similar dissolvability theory, the improvements of SiO₂ Nanoparticles improved yarns varied with cotton fibre content in the yarn, and the test proved the feasibility that SiO₂ Nanoparticles as a additive applied in starch. The test results of the performances also showed that SiO₂ Nanoparticles can improve the starch sizing performance that provided a theoretical basis for the SiO₂ Nanoparticles applied in the actual fabric manufacture.