Hydrophobic Modification And Properties Of Melamine-formaldehyde Foam

With the increasing development of the oil transportation industry,oil spills occur frequently.Oil leakage bring a great harm to environment.The use of oil-absorbing materials to absorb oil spills is an effective method to do remediation.Although the existing oil-absorbing materials are rich in raw materials and low in price,they cannot meet actual needs because of low oil absorption,low utilization,and difficulty in recycling.With the aim of low-cost,high-efficiency,long-life oil-absorbinmaterials,this paper used a commercial melamine-formaldehyde（MF）foam as a substrate,which was hydrophobically and oleophilic-modified to obtain a highly efficient adsorbent material.The specific research content is as follows:（1）The surface of the MF foam was modified with stearic acid（SA）having a long chain alkane to obtain a hydrophobic and lipophilic SA/MF foam.The effect of SA dosage on the morphology and water contact angle of SA/MF foam was investigated.The water contact angle of SA/MF foam was as high as 147°,and the adsorption capacity of various oils and organic solutions reached 22-38 wt/wt.The flame retardancy of the SA/MF foam was investigated by means of a direct open flame.The results show that the foam has good flame retardancy.（2）With magnetic Fe₃O₄ micro-nanoparticles,the surface roughness of MF foam on the basis of the original SA modification was increased,and make the SA@Fe₃O₄/MF foam have magnetic response performance.A one-step coprecipitation preparation method was proposed.The influence of different SA@Fe₃O₄ content was discussed and the best preparation conditions were obtained.The results of water contact angle（WCA）and oil absorption rate tests show that the hydrophobicity and oil absorption performance of the SA@Fe₃O₄/MF foam prepared on the surface were improved compared to the SA/MF foam.The water contactangle of the SA@Fe₃O₄/MF foam reached 156° and the oil absorption ratio was 38-80 wt/wt.SA@Fe₃O₄/MF foam also has good cycle performance.（3）RGO/MF foams were prepared using a hydrothermal reduction method.A small amount of RGO can make the MF foam achieve hydrophobic property.In addition to superhydrophobicity,selectivity,and cycle performance,RGO/MF foams also have a large oil absorption capacity and the adsorption capacity reached 73-134 wt/wt.