Reinforced oil-absorptive membrane material, unit and preparation method thereof

Abstract

A reinforced oil-absorptive membrane material, includes: a tubular support ( 101 ) and an oil absorbing layer ( 102 ) provided on a surface of the tubular support ( 101 ), wherein a plurality of holes are provided on the tubular support ( 101 ); and the oil absorbing layer ( 102 ) is a piece of nonwoven fabric with a polymer layer provided thereon. The reinforced oil-absorptive membrane material has an excellent oil-absorbing and supportive performance, and is capable of being utilized continuously in a negative pressure suction manner and thus shows high oil absorption efficiency. A method for manufacturing the reinforced oil-absorptive membrane material including pre-treating the nonwoven fabrics by aqueous alkali, covering a membrane casting solution including a solvent, a graphene, polyvinylidene fluoride, pore-forming agent and inorganic particle, and then solidifying and extracting to obtain the oil-absorbing layer.

What is claimed is: 
     
         1 . A reinforced oil-absorptive membrane material, comprising: a tubular support ( 101 ) and an oil absorbing layer ( 102 ) provided on a surface of the tubular support ( 101 ), wherein a plurality of holes are provided on the tubular support ( 101 ); and the oil absorbing layer ( 102 ) is a piece of nonwoven fabric with a polymer layer provided thereon. 
     
     
         2 . The reinforced oil-absorptive membrane material, as recited in  claim 1 , wherein the nonwoven fabric is a spun-bonded and spunlace blend nonwoven formed by polyethylene glycol terephthalate and polyamide by a proportion of 7:3; the polymer layer comprises: polyvinylidene fluoride, graphene, hydrophobic inorganic particles and residual pore-forming agent. 
     
     
         3 . The reinforced oil-absorptive membrane material, as recited in  claim 2 , wherein the hydrophobic inorganic particle is hydrophobic silica or hydrophobic titanium dioxide. 
     
     
         4 . The reinforced oil-absorptive membrane material, as recited in  claim 1 , wherein materials of the tubular support ( 101 ) is polyurethane (PU), polyethylene, polypropylene, polyamide and polyvinyl chloride. 
     
     
         5 . The reinforced oil-absorptive membrane material, as recited in  claim 1 , wherein an external diameter of the tubular support ( 101 ) is at a range of 8-12 mm, a thickness of a wall of the tubular support ( 101 ) is at a range of 1-2 mm, a plurality of holes are provided on the tubular support ( 101 ), and a hole density of the holes is at a range of 2.54-7.62 PPI, and a diameter of the holes is at a range of 1-2 mm. 
     
     
         6 . A method for manufacturing a reinforced oil-absorptive membrane material, comprising following steps of:
 (1) pre-treating nonwoven fabric comprising: preparing aqueous alkali with a concentration of 1˜6 wt. %, dipping the nonwoven fabric into aqueous alkali for 1-5 h, taking the nonwoven fabric out from the aqueous alkali and drying, so as to obtain a surface engraved nonwoven fabric;   (2) preparing solution for membrane casting, wherein the casting membrane solution comprises components of:   
       
         
           
                 
                 
                 
                 
               
                     
                     
                 
                     
                   solvent 
                   59~90 
                   wt. %; 
                 
                     
                   graphene 
                   0.1~1 
                   wt. %; 
                 
                     
                   polyvinylidene fluoride 
                   5~20 
                   wt. %; 
                 
                     
                   pore-forming agent 
                   2~20 
                   wt. %; 
                 
                     
                   inorganic particle 
                   1~5 
                   wt. %; 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
               
            
           
         
         wherein the solvent is a good solvent for polyvinylidene fluoride, the step of preparing the membrane casting solution comprising: dispersing the graphene into the solvent, so as to obtain a graphenegraphene dispersion; then adding polyvinylidene fluoride, pore-forming agent and inorganic particles into the graphenegraphene dispersion, stirring for 3-6 hours at 60˜90° C., so as to obtain the solution for membrane casting; 
         (3) preparing the oil absorbing layer, comprising: tiling the nonwoven fabric pre-treated in the step (1) fixing the nonwoven on a glass plane, soaking the nonwoven fabric by the solution obtained in the step (2) in previous, knifing the casting solution on a surface, and then dipping the glass plane into water with a temperature at a range of 10-50° C. for 12-48 hours and taking out, and then dipping into absolute ethyl alcohol for 12-24 hours, in such a manner that the pore-forming agent is extracted out, drying in a room temperature to a constant weight, so as to obtain nonwoven fabric with single membrane; and do the membrane casting process again for obtaining double coating as the desired oil absorbing layer; 
         (4) preparing the reinforced oil-absorptive material comprising: winding the oil absorbing layer on a tube wall of the tubular support, wherein the oil absorbing layer completely covers the plurality of holes on the tubular support, so as to obtain the reinforced oil-absorptive material. 
       
     
     
         7 . The method for preparing the reinforced oil-absorptive membrane material, as recited in  claim 6 , wherein the solvent is selected from the group consisting of N,N-dimethyl formamide, N,N-dimethyl acetamide (DMAc), triethyl phosphate, N-methyl pyrrolidone, dimethyl sulfoxide; the hydrophobic inorganic particle is hydrophobic silica or hydrophobic titanium dioxide. 
     
     
         8 . The method for preparing the reinforced oil-absorptive membrane material, as recited in  claim 6 , wherein the pore-forming agent is selected from the group consisting of dioctyl phthalate, di-n-octyl phthalate, dibutyl phthalate and diethyl phthalate (DEP). 
     
     
         9 . A unit for the reinforced oil-absorptive membrane material, as recited in  claim 1 , comprising: a frame ( 2 ), a suspension device ( 3 ) and a plurality of reinforced oil-absorptive materials provided on an external side of the frame ( 2 ); joints provided on both ends of the reinforced oil-absorptive material ( 1 ), wherein the joints connects the reinforced oil-absorptive material ( 1 ) and the frame ( 2 ) to form an integral; wherein the suspension device ( 3 ) is provided on the frame ( 2 ), the buoyancy force of the suspension device ( 3 ) in water is greater than or equal to a gravity of the reinforced oil-absorptive material, the frame ( 2 ) is formed by joint pipe and an interface ( 4 ) for external connection of suction device is provided on the frame ( 2 ). 
     
     
         10 . The unit, as recited in  claim 9 , wherein the reinforced oil-absorptive material ( 1 ) is connected with the frame ( 2 ) by a branch joint, wherein the frame ( 2 ) is a polyurethane pipe, a polyethylene pipe, a polypropylene pipe, polyamide pipe or polyvinyl chloride pipe, wherein the suspension device ( 3 ) is made of high density polyethylene foam.