33results about How to "Stable superhydrophobic properties" patented technology

The present invention provides a preparation method for a super-hydrophobic polypropylene film, and belongs to the technical field of super-hydrophobic films. In the prior art, the existing super-hydrophobic film production requires special processing equipment or a complex process, such that cost is high, and industrialization is difficultly achieved. With the present invention, problems in the prior art are solved. The preparation method for the super-hydrophobic polypropylene film comprises the following steps: (1) weighing a certain amount of a polypropylene particle material, and dissolving in a solvent to form a polypropylene solution with a concentration of 1-100 mg / ml; (2) carrying out casting of the polypropylene solution on a substrate, and drying under an environment with a relative humidity of 75-85% and an ethanol vapor concentration of 5-20% to obtain the super-hydrophobic polypropylene film. The preparation method of the present invention has characteristics of simple process, good reproducibility, no requirement of any expensive equipment, no requirement of complex chemical treatment processes, low cost, and good industrial application prospects, and is suitable for large-scale industrial production.

The present invention discloses a super-hydrophobic high-density polyethylene thin film and a preparation method thereof. A certain amount of high-density polyethylene particles are firstly weighed and dissolved in xylene at 100 to 140 DEG C, so as to form the high-density polyethylene solution with the concentration of 1 to 50mg / ml; then 1 percent to 60 percent of the volume of the solution of ethanol is added in the high-density polyethylene solution; the high-density polyethylene solution which is added with the ethanol is spread on a foundation base by using a flow casting method, and a white thin film which is prepared by drying for 8 to 12 hours under the environment of the relative humidity of 60 to 75 percent and the temperature of 5 to 25 DEG C is the super-hydrophobic high-density polyethylene thin film. The present invention is the super-hydrophobic high-density polyethylene thin film with simple production, stable performance and low cost. The provided method has simple operating process, good controllability, low cost, no need of complicated chemical treatments, no need of the expensive equipments and easy industrialization.

The invention discloses a micro-nanometer silicon carbonization super hydrophobic anti-rotten wood bamboo. The wood body forms a layer of micro-nanometer silicon carbonization super hydrophobic film which is a dense porous film comprising micro-balls that is formed by mixing silicon with diameter of 1-4Mum, silicon carbide and Silica. The diameter of the pore is 10nm to 10Mum. The preparation steps include: (1)putting the awaiting treatment material into the die; (2)weighing the micro-nanometer silicon powder, of which the particle size is less than 500nm; and putting the micro-nanometer silicon powder into the die till the awaiting treatment material is emerged; raising the pressure in die to 50-100MPa for 2 to 10 hours by a press machine; lowering the pressure to 0MPa to get out and to open the awaiting treatment material; removing the silicon on the surface by sanding machine to get the silicon wood. (3) putting silicon wood into the hot press machine which is quickly closed with the pressure rising to 1-6MPa; keeping the pressure for 1-10min; keeping the temperature of the hot platen of the hot press machine from 300 DEG C to 600 DEG C; getting out and obtaining the micro-nanometer silicon carbonization super hydrophobic anti-rotten wood bamboo. With simple operation technique, good control and low cost, the preparation method does not need the complex chemical treatment and expensive equipment which is easy industrialized.

The invention discloses a porous super hydrophobic polypropylene film and a preparation method thereof. The aperture distribution range on the surface of the porous super hydrophobic polypropylene film is 100 nanometers to 10 micrometers, the average aperture is 650 nanometers to 1 micrometer, a contact angle of the surface of the film with water is 150-165 degrees, and roll angles of water dropson the surface of the film are below 5 degrees. The preparation method comprises the following steps of: uniformly mixing polypropylene granules and polystyrene granules in a mixer according to a mass ratio of (1-10):1; preparing the mixed materials into a film semi-finished product consisting of polypropylene and polystyrene by adopting a tape casting method, an extruding method or a calenderingmethod; putting the film semi-finished product in chloroform or tetrahydrofuran for soaking so as to ensure that the polystyrene contained in the film semi-finished product is sufficiently dissolved;and then taking out and drying to obtain the porous super hydrophobic polypropylene film. The porous super hydrophobic polypropylene film has stable super hydrophobic property, good super hydrophobiceffect, simple preparation process, good controllability, low production cost and environmental protection.