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

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.

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 relates to a preparation method for super-hydrophobic chitosan oil-absorbing sponge. The preparation method comprises the following steps: (1) preparing chitosan-based sponge with a three-dimensional porous structure by using a vacuum freeze-drying method; (2) preparing modified Fe3O4 particles, and enabling the modified Fe3O4 particles and nano zinc oxide particles to be loaded in the three-dimensional porous structure of the chitosan-based sponge; and (3) soaking the obtained chitosan-based sponge in octadecanethiol-absolute ethyl alcohol solution, and repeatedly compressing and expanding, after curing, to obtain a product. Compared with existing chitosan-based sponge, the product has excellent hydrophobic oil-absorbing properties, and a high repeated utilization ratio.

The invention discloses a highway construction and maintenance method based on a cement-based composite material. The method comprises the following steps: 1) modifying polyvinyl alcohol fibers; 2) material preparation: firstly, carrying out dry mixing on cement, fly ash and sand for 1-6 minutes; adding water and a water reducing agent, then adding a nano graphene sheet or graphene oxide dispersion liquid, stirring at a low speed for 5-10 minutes, adding modified polyvinyl alcohol fibers while stirring after uniformly flowing cement mortar is obtained, and stirring at a high speed for 5-10 minutes after all the modified polyvinyl alcohol fibers are added; carrying out a flow table fluidity experiment on the slurry in the stirring process until the fluidity of the slurry reaches 200 mm or above and the fibers are uniformly dispersed; 3) precasting cement-based composite material components; and 4) carrying out paving; according to the invention, the construction performance is good, theconstruction cost is low, and construction is convenient.

The invention discloses fluoride-free durable super-hydrophobic cotton cloth and a preparation method and application thereof, and belongs to the field of super-hydrophobic materials. The preparationmethod comprises the following steps that hydrolysis reaction is carried out on 3-methacryloxypropyltrimethoxy silane and silicon dioxide to obtain modified silicon dioxide; secondly, cotton cloth fibers are modified by using 3-mercaptopropyltriethoxysilane, so that mercapto groups on the surfaces of the fibers are functionalized; and finally, under the action of a photoinitiator and illuminationof a mercury lamp, sulfydryl-alkene click chemical reaction is carried out on sulfhydrylation cotton cloth, methacryloyloxy polydimethylsiloxane and the modified silicon dioxide to prepare the super-hydrophobic cotton cloth. The super-hydrophobic cotton cloth prepared by the method has self-cleaning property and an oil-water separation function. Raw materials are cheap, easy to obtain and environmentally friendly, and the prepared material is stable in hydrophobicity and has good wear resistance. Meanwhile, the preparation method is simple, mild in preparation condition and convenient for large-scale production, and has huge industrial application potential.

The invention discloses a product with a coating and a preparation method thereof. The coating comprises a fluorosilane compound with reactive terminal groups. The reactive terminal groups are groups capable of reacting with a base layer of the product. The coating is connected to the base layer of the product by a chemical bond. The coating has good endurance and stable hydrophobicity and can resist a wet environment and external force-caused sliding friction.

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 relates to the technical field of daily articles, and discloses a heating cup. The heating cup comprises a cup body, a cup cap, a temperature sensor, a controller, a control display screen and a heating assembly; the cup body is composed by compactly connecting a heat insulation layer and a cup main body from outside to inside, and a cavity is formed in the middle between the heat insulation layer and the cup main body; a cup opening of the cup main body is in threaded connection with the cup cap; the temperature sensor is arranged in the middle of the inner wall of the cup mainbody, and is electrically connected to the control display screen; the heating assembly is arranged in the cavity; the control display screen is arranged in the middle of the outer side of the heat insulation layer, and is electrically connected with the controller; the controller is arranged at the bottom of the heat insulation layer, and is connected with a power supply through an inserting hole; a processor is arranged in the controller, and receives electrical signals transmitted by the control display screen and tissues orders. According to the heating cup, by additionally arranging the heat insulation layer, the temperature sensor and the heating assembly, through an indirect heating mode, the suitable in-cup temperature is kept, temperature increasing and preservation of a heating object is achieved accordingly, and the using safety is improved.

The invention provides a preparation method of a hydrophobic mineralized waste fiber adsorption material. The method specifically includes pretreatment of waste fibers, ozone treatment, alternative impregnation, hydrophobization modification of mineralized waste fibers, and other steps. This method uses one or more of waste paper, waste sweater, and waste cotton clothes as raw materials. The fibers are treated with ozone to enable grafting with polyacrylic acid and to provide calcium ion attachment points, and then calcium carbonate is added as a medium to realize hydrophobization modificationof the polymer material. The use of highly toxic chemical reagents in the production process is avoided so that the method has an advantage in constructing environmentally safe functional materials.The waste fibers obtained through modification have higher oil absorption and oil retention rates for a plurality of types of oil, and have better adsorption performance. The prepared oil-absorbing material is environment-friendly, cheap and simple to prepare and has potential application value in oil-water pollutant treatment.

The invention provides a paper protection method for improving surface hydrophobicity. The paper protection method comprises the following steps: 1) soaking paper with an alkaline solution; 2) applying a zinc acetate dehydrate solution to the paper, and reacting on the surface of the paper to generate a zinc oxide precursor; and 3) carrying out dehydration reaction on the treated paper at 70-85 DEG C to obtain the paper with flaky zinc oxide on the surface. According to the method, sheet-shaped zinc oxide crystals in a specific form are loaded on paper fibers to improve the hydrophobicity of the surface of the paper, so that the hydrophobicity of the surface of the paper can be improved under the condition that ink marks, pigments and paper bodies on the surface of the paper are not damaged.

The preparation method comprises the following steps: (1) reacting a mixed solution containing zirconium chloride, terephthalic acid, inorganic acid, aromatic monocarboxylic acid and N, N-dimethylformamide to obtain a metal organic framework material; (2) dispersing the metal organic framework material in a monocarboxylic acid solution for reaction to obtain a mesoporous metal organic framework material; and (3) dispersing the mesoporous metal organic framework material in n-heptane, adding low-molecular-weight polysiloxane, and curing to obtain the hydrophobic mesoporous material. Aromatic monocarboxylic acid benzoic acid is added in the process of synthesizing UIO-66 to cause defects at coordination sites, then monocarboxylic acid is used for carrying out ligand exchange on the coordination sites of UIO-66 and terephthalic acid at high temperature and high pressure, the defects are expanded, pore channels of several nanometers to dozens of nanometers are formed, and the UIO-66 is synthesized. And finally, carrying out cross-linking curing on the surface of the nano material by using low-molecular-weight polysiloxane under a vacuum condition to form a layer of hydrophobic membrane.

The invention provides a method for improving the desalination stability of a porous ceramic membrane by constructing a hydrophobic protective layer. The method comprises the following steps: firstly, carrying out hydrophobic modification on the surface of a porous ceramic membrane by using a hydrophobic modifier, then spraying a pore-forming agent solution on the surface of the porous ceramic membrane, and drying to crystallize the porous ceramic membrane into pore-forming agent particles; then, diluting PDMS with an organic matter, and adding a certain proportion of hydrophobic nano silicon dioxide particles; uniformly spraying a PDMS solution containing SiO2 onto the surface of the ceramic membrane on which the pore-forming agent particles are fully distributed, and curing; and soaking the cured ceramic membrane in water to dissolve the pore-forming agent particles, and drying to obtain the porous ceramic membrane with a porous PDMS protective layer constructed on the surface. The obtained ceramic membrane has the advantages of being good in air permeability, high in hydrophobic stability, stable in chemical property, low in cost, simple in method and the like, when the ceramic membrane is applied to membrane distillation desalination, the desalination rate is kept 100%, and continuous experimental operation can be conducted for 300 h or above.

The invention provides a preparation method of a durable hydrophobic fabric. The preparation method of the durable hydrophobic fabric comprises the steps of, firstly, preparing hydrophobic cross-linked polystyrene microspheres; secondly, performing surface modification on the prepared hydrophobic cross-linked polystyrene microspheres to form reaction-active -NCO functional groups on the surface of the hydrophobic cross-linked polystyrene microspheres; thirdly, grafting the modified hydrophobic cross-linked polystyrene microspheres onto the surface of a fabric to obtain the durable hydrophobic fabric. The prepared hydrophobic cross-linked polystyrene microspheres are stable in performance, simple in technical processes, low in raw material cost and easy to produce; by structuring a hydrophobic structure on the surface of the fabric through the surface-modified hydrophobic cross-linked polystyrene microspheres, significant hydrophobic effects can be achieved and maintained for a relatively long term; the processing temperature is mild and can effectively reduce influence on the original performance of the fabric; through a chemical bonding mode, the surface-modified hydrophobic cross-linked polystyrene microspheres are grafted to the surface of the fabric, so that the fabric can keep good hydrophobic effects after being washed for a number of times.