32results about How to "Increased static contact angle" patented technology

The invention discloses a process method for preparing an ultra-hydrophobic surface by the electrochemical method. The process adopts two processing steps: forming the micro nanometer double-structurerough surface by first electrochemical etching and then oxalic acid anodic oxidation; and preparing the ultra-hydrophobic surface by modifying the surface with fluorosilane. The method is simple andpractical, uses mature electrochemical etching and anodic oxidation technology, allows for easy mass production and avoids environmental pollution.

The invention belongs to the field of preparation of micro or/and nano-structures on surfaces of solids and specifically relates to a copper-based super-hydrophobic composite film with a low friction coefficient and a preparation method thereof. The copper-based super-hydrophobic composite film with the low friction coefficient is characterized in that a composite structure with a micro-scale cuprous oxide crystal structure and submicro-scale metal silver particles is firstly formed on the surface of a copper-based material, and then surface chemical modification is performed to obtain a product. Each contact angle between the copper-based super-hydrophobic composite film with the low friction coefficient and water exceeds 150 degrees, the friction coefficient is low (can be as low as about 0.1) and can be stably kept, and the copper-based super-hydrophobic composite film has good super-hydrophobic performance and relatively low friction coefficient.

The invention discloses a composite silane film for metal surface. The composite silane film comprises a bihydrolysis head based silane layer and a monohydrolysis head based fluorine-containing silane layer. The composite silane film can be used for preventing corrosion and scaling, solves the problem that existing metal is prone to local corrosion and scaling in bad working conditions like seawater, sewage and chemical media and is high in compactness and superior in corrosion-resistant effect.

The invention discloses a water-based hydrophobic coating as well as a preparation method and application thereof. The coating comprises the following components in mass fraction: 57-80% of modified fluorocarbon resin, 2.4-4.8% of coalescing agent, 0.5-0.8% of base material wetting agent, 0.3-0.8% of leveling agent, 0-0.2% of antifoaming agent, 0-1% of thickener, 1-2% of hydrophobic agent, 3.8-7.7% of curing agent, and the balance liquid paraffin. The prepared fluorocarbon resin water-based hydrophobic coating has excellent film forming property and hydrophobicity, has high coating adhesion, is safe and environment-friendly, has simple process, and is easy for industrial production and large-scale popularization and application.

The invention discloses a method for making a waterproof, oil-proof and antistatic polyester needled felt by magnetron sputtering-plasma. The method comprises the following steps: adding an adhesive polyacrylate to a nanometer antimony tin oxide dispersion to prepare a finishing solution, carrying out water bath heating on the finishing solution, placing a pretreated polyester needled felt in theheated finishing solution, oscillating the solution with the felt, and carrying out two-dip-two-padding, pre-drying and curing to obtain an antistatic finished polyester needled felt; and vacuumizinga vacuum chamber, introducing argon, carrying out pre-sputtering, fixing the antistatic finished polyester needled felt on a sample holder, rotating the sample holder, and carrying out magnetron sputtering on the polyester needled felt with polytetrafluoroethylene through a radiofrequency source magnetron sputtering technology by using a high-vacuum multifunctional magnetron sputtering device to obtain the waterproof, oil-proof and antistatic polyester needled felt. The obtained waterproof, oil-proof and antistatic polyester needled felt is placed in a normal-pressure plasma processing device,a vehicle speed and a treatment voltage are set, and the above polyester fabric goes through a plasma treatment area in a nitrogen atmosphere.

The invention discloses a self-demolding mold, which comprises a mold base material, the use surface of the mold base material is coated with a self-demolding layer, and the self-demolding layer is an inorganic coating; wherein the inorganic coating is prepared from the following components by mass: 25-45 parts of nano silicon dioxide sol, 25-45 parts of organosilane, 5-10 parts of functional filler, 5-15 parts of water, 10-20 parts of inorganic pigment, 2-5 parts of a functional additive and 0.1-2 parts of a thickening agent. The mold disclosed by the invention has the characteristics of self-demolding property, high environmental friendliness, reduction of production flow and saving of production time and production cost.

The invention provides a PVC film with a self-cleaning function, and belongs to the technical field of chemical materials. The invention discloses a PVC (polyvinyl chloride) composite material which comprises the following raw materials in parts by weight: 80-120 parts of PVC resin powder, 20-25 parts of a plasticizer, 20-25 parts of a stabilizer, 15-25 parts of polyethersulfone and 1-5 parts of fluorine-containing polysiloxane. The fluorine-containing polysiloxane forms relatively loose ion pairs, a micro-nano coarse structure simulating the lotus leaf surface is formed, the super-hydrophobic state is achieved, the static contact angle of water drops on the surface of the PVC film can be remarkably increased, more gas is intercepted, at the moment, the liquid drops are not prone to permeating into the coarse structure, and the PVC film has the excellent self-cleaning performance.