Research On Thermo-regulated Fabrics With The Technology Of Phase Change Microcapsules

This paper mainly studied the protective effect of thermo-regulated fabrics, when it was stimulated in hot and cold conditions. As we all know, currently there are varieties of phase change thermo-regulated fabrics on the market, but most of their enthalpy cannot meet the need to balance the human body’s microenvironment. So a new phase change thermo-regulated fabric with wadding material was designed to get better phase change thermal hysteresis.First, according to the theory, choose a proper core material that mainly influences the performance, the phase-change temperature and the enthalpy value, of the phase change microcapsules. Then select the suitable monomers according to the wall material and the right solvents, etc. Finally, synthesize the phase change microcapsules with the large enthalpy value and stable performance in interfacial polymerization method. The results are the followings: 1) The shape of the phase change microcapsules are full particles and their morphology is smooth and compact, when it is the core material of phase change paraffin OP28 E, the wall material of monomer MDI-50 and monomer polyethylene glycol 4000(PEG-4000), the solvent of dichloromethane(CH2Cl2), the dispersant of tricalcium phosphate(TCP) and the optimum proportion of the core and the wall material of 3g: 3g. And in the microencapsulation process, the shape remains constant but the wall material thickness increases. 2) The phase change temperature of homemade phase change microcapsules and paraffin is 28.2 ℃, 27.8 ℃, respectively. Their temperature is almost the same, which means the wall material has little or no compact on the paraffin. When the coating rate of the phase change microcapsules is 45%, the enthalpy value is up to 81.3 J/g that accounts for about 41% of the pure paraffin’s, which indirectly proves the of the coating rate of the phase change microcapsules. 3) It was used infrared analysis(FTIR), laser particle size analyzer(DLS), thermal gravimetric analysis(TG) to get the results: the polyurethane phase change microcapsules are coated with the paraffin successfully. The diameter of phase change microcapsules is about 50μm, which presents normal distribution. And they could withstand temperatures within 200 ℃, which means great heat resistance. So the phase change microcapsules could be applied to textile finishing.The phase change microcapsules were finished to the cotton fabrics and the fine denier polyester fabrics in different finishing processes to get the phase change fabrics with wadding material. In the cotton fabrics, the cross-linking agent APF – 101 is proved better. And the optimum parameters were the cross-linking of 40g/L, the curing temperature of 125℃ and the curing time of 60 s. In the fine denier polyester fabrics, the optimum parameters were the coating thickness being equal to the thickness of 2 mold, curing temperature of 125℃ and the curing time of 60 s.At last, the surface transient temperature tester on the phase change textile that collects and saves data from 4 different regions frequently and automatically was made. It is more precise to test the variable temperature curve of the phase-change paraffin and the phase change microcapsules, and the results show that they have a good thermal hysteresis. By comparing the variable temperature curve of the mono-layer phase change cotton fabric, the coating phase change polyester fabric, the phase change compound fabrics(made of the mono-layer phase change cotton fabric and the coating phase change polyester fabric) and the phase change thermo-regulated fabrics with wadding material, it is concluded that the last one have a greatly better thermal hysteresis. it is 4 min for the phase change thermo-regulated fabrics with wadding material to change temperature during 20℃ and 36℃, but it is within 10 s for the others.