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.

A hydrophobic fumed silica treated with a cyclic dimethylsiloxane, the hydrophobic fumed silica having an M-value representing an oleophilic degree in a range of 48 to 65, a tapping bulk density of not smaller than 80 g / L but not larger than 130 g / L, and an n-value representing the dispersion of 3.0 to 3.5 as measured in toluene. The hydrophobic fumed silica features a high bulk density while exhibiting a high hydrophobic property, the powder thereof capable of being favorably handled, being easily mixed in a matrix such as of a resin within short periods of time, and, further, being dispersed in the matrix to a high degree.

The invention discloses a preparation method of modified silicon dioxide obtained via super-hydrophobic modification. The preparation method comprises following steps: 1) a raw material A (a silicon dioxide base material, dry powder) is delivered into a mixer, a mixed state is maintained, a raw material C (a super-hydrophobic modification accessory ingredient prepared via mixing of 1.5% acetic acid aqueous solution and isopropanol at a mass ratio of 1-3:4-10) is atomized, and is sprayed into the mixed uniformly, and stirring is kept; 2) a raw material B (a hydrophobic modification agent organic silane coupling agent) is atomized, and is sprayed into the mixer uniformly, and stirring is kept; 3) aging is carried out; and 4) ultrafine grinding is carried out so as to obtain a finished product. Fewer processing steps are needed; energy consumption is low; requirements of industrialized large-scale production can be satisfied; particle size distribution of the modified silicon dioxide obtained via super-hydrophobic modification is uniform; pore structures are stable; and hydrophobic performance is stable. The prepared super-hydrophobic silicon dioxide prepared via the preparation method is taken as a flatting agent, and can be used for providing paint with super hydrophobic performance; film forming coating particle arrangement is uniform; and luster is soft.

The present invention discloses a hydrophobic-oleophilic and hollow fiber composite membrane and preparing method thereof. A preparing method includes preparing hollow tubular braids by two-dimensional braided technique using polyester filaments, wherein the hollow tubular braids are used as the reinforcements. The method further includes mixing polyvinylidene fluoride, hydrophobic pore-forming agent, and the rest of solvent to prepare a casting solution of surface separation layer. The method further includes pre-treatment processing of the reinforcements; and coating the casting solution of surface separation layer on the outer surface of the processed reinforcements through a spinning spinneret to form a primary membrane. The reinforcements are replaced by the primary after post-processing, and repeating the coating process.

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 relates to the technical field of polymer materials, and discloses a high-strength flame-retardant ABS alloy material and a preparation method of the high-strength flame-retardant ABS alloy material. The ABS alloy material comprises the following raw materials in parts by weight: 20 to 80 parts of an ABS copolymer, 10 to 70 parts of polycarbonate, 3 to 10 parts of a compatibilizer, and 0.1 to 0.5 part of an antioxidant; the components are mixed, subjected to melt blending, extruded, air-dried and granulated to obtain the ABS alloy material. The alloy material disclosed by the invention has high strength and excellent fire resistance.

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 provides a hydrophobization modification method for ramie nano cellulose. The method comprises the steps of preprocessing ramie nano cellulose and xylan, then carrying out modification reaction on the ramie nano cellulose and xylan, adding the soaked and wetted ramie nano cellulose into a hardwood xylan solution, putting into ultrasonic and dispersing, stirring by a machine, layering the mixture by centrifuging, transferring the upper layer clear liquor, and molding the left concentrated ramie nano cellulose suspension liquid through liquid nitrogen vacuum freeze drying so as to obtain the dehydrated modified ramie nano cellulose. Dehydrated modification is carried out on the ramie nano cellulose by using the acetylation of the hardwood xylan, so that the polarity and hydrophilia of plant fiber are lowered, the agglomeration of nano cellulose is inhibited, and the interfacial compatibility and cohesiveness of the ramie nano cellulose and the hydrophobic resin are improved. The method is simple and efficient, has good repeatability, has environment-friendly processes, uses the environment-friendly modification reagents, and has great scientific significance and considerable application prospect.

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.