30results about How to "Hydrophobic performance is stable" patented technology

The invention discloses an anticorrosive coating based on fluorine-silicon modified acrylic resin. The coating contains the following components in percentage by weight (100% in all): 30%-50% of fluorine-silicon modified acrylic resin, 10%-45% of flaky zinc powder, 10%-30% of flaky mica plates, 5%-10% of ferrophosphorus powder, 0.5%-2% of a polyurethane-polyether block copolymer and 10%-15% of butyl acetate, wherein the fluorine-silicon modified acrylic resin is prepared by polymerizing fluorine-silicon acrylate with acrylate in a molar ratio of 1 to (2-5) under the action of azo initiators, and the fluorine-silicon modified acrylate is prepared through reaction of perfluoroalkyl ethyl alcohol, aromatic diisocyanate, polydimethylsiloxane and acrylate in a molar ratio of 1 to 1 (1-1.2) to (1-1.2) to (2-5). By designing the novel fluorine-silicon modified acrylic resin, fluorine-silicon groups are uniformly distributed in macromolecules, and the fluorine-silicon modified acrylic resin anticorrosive coating has the effect of stable performance.

The invention discloses a preparation method of a superhydrophobic strain sensor composite material. The present invention introduces fluorinated polydimethylsiloxane as a building block, and then prepares a superhydrophobic stretchable sensor based on a mixture of fluorinated polydimethylsiloxane, perfluoropolyether and carbon nanotubes. The as-prepared samples showed a stable response even after extensive cyclic stretching, scraping, hand rubbing, sandpaper abrasion, 200 °C heat treatment, acid / alkali / salt attack, and high-speed drop / water jetting. Remains superhydrophobic with excellent mechanical strength and resistance to liquid impact. In addition, as a wearable strain sensor, the sample can maintain excellent sensitivity, durability, and repeatability when detecting finger or wrist bending, neck bending, and eye blinking, providing a reliable basis for the development of strain sensors.

The invention discloses a cotton fabric hydrophobic finishing method based on an acrylics-modified silicon ball-electron beam technology, and belongs to the field of functional textiles. The method disclosed by the invention adopts an electron beam radiation technology, the method can react under room temperature, the energy consumption is low, an initiator does not need to be added, the reaction time is short, and the production cost can be obviously reduced; long-chain acrylic acid can be selected and used as monomers, so that the free energy of fabric surface can be obviously reduced, and meanwhile the environment-friendly problem easily generated by a fluorine-containing reagent is avoided; the roughness of the fabric surface can be improved through the addition of modified silicon dioxide, and meanwhile the problem, such as low adhesion caused by pure physical absorption, of silicon dioxide silicon balls is avoided. According to the method in which the lower surface energy is combined and the fabric surface roughness is improved, textiles with high hydrophobic performance are obtained through an electron beam one-step radiation graft polymerization technology.

The invention discloses a fluorine-free durable super-hydrophobic cotton cloth, a preparation method and application thereof, and belongs to the field of super-hydrophobic materials. The method uses 3-methacryloxypropyltrimethoxysilane and silicon dioxide to undergo a hydrolysis reaction to obtain modified silicon dioxide; secondly, modify the cotton fiber with 3-mercaptopropyltriethoxysilane mercapto functionalization on the fiber surface; finally, under the action of photoinitiator and mercury lamp illumination, the mercaptolated cotton cloth reacts with methacryloxypolydimethylsiloxane and modified silica to generate mercapto- The superhydrophobic cotton cloth is prepared by olefin click chemical reaction. The superhydrophobic cotton cloth prepared by the method has the function of self-cleaning and oil-water separation. The invention not only has cheap and easy-to-obtain raw materials and is environmentally friendly, but also has stable hydrophobicity and good wear resistance of the prepared material. At the same time, the preparation method is simple, the preparation conditions are mild, it is easy to scale up production, and it has great industrial application potential.

The invention belongs to the technical field of building materials, and particularly relates to a waterproofing agent for concrete and a preparation method thereof. The product developed by the present invention includes the following raw materials in parts by weight: 10-20 parts of sulfated bacterial cellulose, 10-25 parts of graphene oxide, 300-500 parts of water, 0.3-0.5 parts of citric acid, 3-5 parts of parts of organosilane, 0.1-0.3 parts of sodium hypophosphite, and 0.1-0.3 parts of emulsifier; the organosilane is embedded between graphene oxide layers. Wherein, the graphene oxide molecular structure includes a conjugated region, the conjugated region includes a hydroxyl group and an epoxy group, and at least part of the epoxy group is substituted by octadecylamine. In addition, it also includes gelatin with a mass of 10-20% of sulfated bacterial cellulose; the gelatin is selected from gelatin with an isoelectric point of 6.0-6.5. The product obtained by the invention has excellent long-term waterproof performance.

The invention provides a method for modifying polyvinyl alcohol fiber for a high-ductility cement-based composite material. The surface of the polyvinyl alcohol fiber contains a large amount of hydroxyl groups, the hydroxyl groups on the surface of the polyvinyl alcohol fiber react with a cement matrix to form a relatively strong chemical bonding force, and the strong chemical bonding force causesfiber breakage in the pull-out process, so that the ductility is affected. The method comprises the following steps: with the polyvinyl alcohol fiber as a raw material, firstly coating the surface ofthe polyvinyl alcohol fiber with a layer of epoxy resin, and then coating the surface of epoxy resin coating with a layer of fumed silica powder. Due to surface hydrophobicity of the modified polyvinyl alcohol fiber, the interfacial strength between the polyvinyl alcohol fiber and the cement matrix can be effectively weakened and the chemical bonding force can be reduced, so that the polyvinyl alcohol fiber is pulled out of the cement matrix in the stretching process, without breakage; the hydrophobicity and the wear-resistant slip property of a product are more stable, and the coating is more wear-resistant and the original physical and mechanical properties of the PVA fiber are not affected.