Study On Microcapsule Technique Applying To The Treatment For Covered Fabric

Covered fabric is less breathable for the covering film is composed with macromolecule material, which prevents the air from premeating between the two sides of the fabric. Many ways have been studied to improve the breathability of covered fabric with the disadvantage of high expenditure or severe contamination. On considering of these, This paper deals with a study of a kind of microcapsule which applying to the covered fabric to improve its breathability.In-Situ Limited Coalescence Polymerization was employed to prepared microcapsule in this paper. Using MMA as wall material and water as core. Then attempting to mix the microcapsules with finishing agents and add to fabric to improve the covering fabric breathability. This work is mainly consists of three parts. Firstly, the mixed proportion and the amount of emulsifier were approximately determined;secondly, the effects of several factors including core and shell materials, dispersants etc on microcapsule's formation and performance were studied, and the optimal technical specifics for microcapsulation were identified;thirdly, microcapsules were applied to the covering treatment and measure thefinishing result. With the ade of SEM, LS-13320 Laser Diffraction Particle Size Analyzer, the effects of the preparation's parameter on microcapsule's size, size distribution and other performance were studied and discussed.Experiment result indicates: using Span and Tween, the two important non-ionic surfactants, as emulsifier to disperse can gain even and steady emulsion of W/O. Emulsifier means great importance to the whole system, which is the foundation for successfully microcapsuled. Emulsifier and blending speed have a great effect on the microcapsules's size and size distribution. With the increasing amount of emulsifier or higher blending speed, the microcapsules have smaller size and narrower size distribution. When azodiisobutyronitrile was used as initiator other than dibenzoyl peroxide, the microcapsules had narrower size distribution. In addition to the above factors, there are other factors including the amount of monomer, the ratio of shell and core material, the time of emusification, the polymerizing temperature and so on .The optimum project had been ensured in the end. Small and even microcapsules had been prepared On the condition of that 19.1% the ratio of water and coal oil, 2% the amount of Span80, 0.1%-0.5% the amount of initiator, 12 minutes of emusifying on normal temperature, 1400r/min of blending speed, 400-500 r/min blending speed of polymerization and 65 "C of initiating temperature. In craft conditions of post-treatment such as the thickness of microcapsule suspension 30%, baking condition of 130°C and five minutes. In the end,by means of instrument to measure the finished fabric, the breathability ofthe covered fabric had been improved.The correlative report about the idea of this paper had not been found.Therefore the fundamental research in this area has theoretical importance.Although the work described in this paper is a preliminary attempt in thisfield, it establishes a very useful foundation for further research.Hu Dayan (Textile Engineering) Supervised by Guo Jiansheng...