Study On Wettability Control And Performance Of 3D Printed Porous Materials

Because of its unique non-wetting property,superhydrophobic surface has a wide range of applications in oil/water separation,evaporation,self-cleaning,condensation,etc.In this study,a superhydrophobic porous material was prepared by 3D printing method,and its wettability,evaporation,oil/water separation and other properties were analyzed.This study provides a new method for the rapid preparation of new superhydrophobic porous material,which has certain practical value and theoretical significance.The research contents of this paper are as follows:(1)The porous samples were prepared by 3D printing PLA method,and then the wettability of the porous samples were controlled by MEK solution,FDTS solution and HN-SiO2.The effects of immersion time of MEK,modification time of FDTS and content of HN-SiO2 on wettability were investigated.The results of the study shows that when sample0 is immersed in MEK solution with HN-SiO2 content of 0.4g for 1min,and modified by FDTS solution,the CA=171.8° and SA=5.03° of sample C were obtained by FDTS solution modification.Under this condition,the sample obtained is the optimal sample.Under these conditions,the oil/water separator has a good separation effect on n-hexane,petroleum ether,toluene,liquid paraffin and oil.(2)The 3D printing PLA method was used to prepare porous samples for evaporation experiments.The evaporation mode,evaporation time,droplet pulsation,droplet volume and evaporation rate of droplet on hydrophilic,hydrophobic,adhesive superhydrophobic and sliding superhydrophobic surfaces were analyzed.The results show that the droplet changes in the MIX mode on the hydrophilic surface,while the droplet changes in the CCA,CCR and MIX mode on the hydrophobic and superhydrophobic surface.The higher the degree of hydrophobicity,the longer the time of complete evaporation,the sliding superhydrophobic surface droplet complete evaporation time is the longest.The wetting model will change when the droplet is about to evaporate clean.Through the calculation of droplet volume change,the relationship between droplet volume of hydrophobic and superhydrophobic surface and time conforms to the 2/3 power law,which verifies the correctness of the experiment.The evaporation rate of droplet on hydrophobic and superhydrophobic surfaces fluctuates slightly and gently,while on hydrophilic surfaces the evaporation rate fluctuates greatly.(3)Firstly,HN-SiO2 was dispersed in photosensitive resin for modification,and then the sample with porous structure was printed by photocurable 3D printing technology.Then the sample was modified with FDTS solution to obtain the 3D printed sample with superhydrophobic performance.Finally,the performance of the superhydrophobic sample was analyzed.The effects of HN-SiO2 content and modification time on wettability were investigated.The results show that the wettability control analysis shows that when the mass fraction of HN-SiO2 is 1.5% and the modification time is 45 min,the optimal sample F is CA=166.1° and SA=5.62°.Through the oil/water separation can know that under this condition of the oil/water separator treatment of n-hexane,toluene,petroleum ether,chloroform and soybean oil separation efficiency can reach more than 95%,after several separation can also reach more than 88%.The self-cleaning performance of porous superhydrophobic material was analyzed.According to the freezing performance analysis,the porous superhydrophobic sample surface is not anti-freezing under the action of porous structure.