| In recent years,superhydrophobic materials have become the focus of researchers because of their potential application value in antifouling self-cleaning,drag reduction,oil-water separation and other fields,and their important research significance in biology,medicine,industry and other fields.However,due to their unique surface structure and chemical composition,it has problems such as poor durability,poor mechanical properties and fluorine content,which is difficult to meet actual demand.In order to prepare long-lasting and durable superhydrophobic materials,this topic uses silicone resins and acrylic resins with good thermal stability,strong weather resistance,high hardness and environmental friendliness as raw materials.Then through the method of chemical bond grafting,organic silicone resin and acrylic resin are combined to prepare the matrix resin.Finally,the cotton fabric is coated by the obtained matrix resin to prepare a long-lasting superhydrophobic composite with self-cleaning/oil-water separation ability,as well as sponge.(1)The surface of cotton fabric is modified to become hydrophobic by electrospinning.In this chapter,a hydrophobic resin with both the properties of silicone and acrylic resin was designed,and then the composite resin was applied to the surface of the cotton fabric by electrospinning with cotton fabric as a carrier,and by changing the spinning process to control the morphology of the composite resin on the surface of the cotton fabric to improve the hydrophobicity of the composite material.The results show that the water contact angle of the prepared composite material can reach 156.7 ± 1.6 °,the rolling angle can reach 6.7 ±1.1 °,and it has superhydrophobicity to water,as well as acid-base solutions;at the same time,the prepared superhydrophobic composites still have good hydrophobicity after being vertically impacted by 100 m L of water flow at a speed of 1.4 m/s.In addition,the prepared superhydrophobic cotton fabric also has good antifouling and self-cleaning performance.(2)The surface of cotton fabric is modified to become hydrophobic by spraying method.In this chapter,a silicon-acrylic hybrid resin with self-layering properties was designed,and then the composite resin was applied to the surface of the cotton fabric by spraying with cotton fabric as a carrier.The cured coating could form two layers,of which the bottom layer was the acrylic component can form polar bonds or hydrogen bonds with the cellulose molecules on the surface of the cotton fabric to enhance adhesion,while the silicone resin on the surface,as a functional component,can effectively improve the hydrophobicity of the cotton fabric.The results show that the prepared the water contact angle of the composite can reach 156.77 ± 1.9 °,and the rolling angle can reach 8 ± 1.6 °,which is superhydrophobic.At the same time,the fabricated composites also have sufficient mechanical strength and high temperature resistance,which can withstand 20 cycles of abrasive paper abrasion under a constant load of 500 g and maintain high hydrophobicity after high temperature baking at 120 °C.In addition,the modified cotton fabrics exhibit stable oil-water separation ability and other functional properties,and have potential applications in many surface treatments of cotton fabrics.(3)The surface of sponge fiber is modified to become hydrophobic by soaking method.In this chapter,107 silicone rubber modified acrylic resin was used as the functional resin,and then it was coated on the surface of the sponge by soaking method to prepare a superhydrophobic composite with a water contact angle of 152 ± 1.6 ° and a rolling angle of9 ± 1.1 °.The prepared superhydrophobic composite material has excellent hydrophobicity and lipophilicity,and can adsorb various organic solvents such as alkanes,esters and ethers,among which the adsorption capacity of chloroform can reach more than 200 g/g.The superhydrophobic composite still maintains good hydrophobicity and oil absorption ability after 20 times of adsorption release,400 times of compression relaxation test and high temperature baking at 150 ℃.In addition,the superhydrophobic sponge also has stable oil-water separation ability,which has potential application value in controllable oil-water separation. |
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