302results about How to "Lower surface free energy" patented technology

The invention relates to a fluorine-free superhydrophobic finishing agent containing modified nano silicon dioxide hydrosol and application thereof. The finishing agent is prepared by the following steps of: (1) mixing a precursor, an anionic surfactant and water and stirring violently at the temperature of between 20 and 50 DEG C; and (2) slowly adding ammonia water serving as a catalyst dropwise, stirring, adding long-chain alkylsiloxane serving as a modifier and stirring continually so as to obtain modified SiO2 hydrosol. The finishing agent has a stable property, avoids the pollution of an organic solvent and has high water repellency when used for performing superhydrophobic finishing on textiles.

The invention relates to a method for improving the bonding strength of a hard alloy and a diamond coating. The method is realized by the technical scheme that by adopting a double glow plasma surface alloying technology, taking a metal carbide forming element material or a composite material of metal carbide forming elements as a target, inert gases as protecting gases, as well as carbon-containing gases as precursors, a diffusion barrier layer is prepared on the surface layer of the hard alloy, and then the diamond coating is deposited on the hard alloy surface on which the diffusion barrier layer is prepared by using a chemical vapor deposition method. By the use of the diffusion barrier layer prepared by the method disclosed by the invention, the diffusion of Co element to the surface layer of the hard alloy can be effectively stopped, the damage to a hard alloy matrix due to a surface Co removing treatment method is avoided, and the interface stress problem introduced by a transition layer applying method due to new interface addition can be avoided, so that the bonding strength between the diamond coating and the hard alloy matrix can be greatly improved.

The invention discloses fluorinated polyurethane and a preparation method thereof. The fluorinated polyurethane is prepared through the steps: fluoroalkyl-containing polyether glycol and diisocyanate perform addition polymerization reaction, a tin catalyst is utilized to catalyze, a chain extender is utilized to extend a chain, and an amino silane coupling agent is added to seal ends. A product contains a fluorine-containing polyether block, the fluorine content is high, fluoroalkyl on a polyether lateral group is prone to generating microphase separation and surface migration, polyurethane surface energy is low, and the fluorinated polyurethane is easy to store and cure as the silane coupling agent is utilized to seal the ends. A water contact angle of a coating prepared from the fluorinated polyurethane is higher than 110 degrees, and the coating has excellent water repellency.

The invention relates to a cement-based capillary crystalline waterproof material based on a nanosilicon-based material and a preparation method and application thereof. The waterproof material is prepared from, by weight, 45-65 parts of cement, 14-32 parts of quartz sand, 5-10 parts of a retarder, 0.1-0.4 part of the nanosilicon-based material, 2-9 parts of a crystal precipitant, 0.5-5 parts of asurfactant, 0.5-2 parts of a complexing agent, 1-5 parts of a calcium ion compensation agent, 0.5-2 parts of a water reducing agent and 0.2-2 parts of cellulose ether. Compared with the prior art, the cement-based capillary crystalline waterproof material is suitable for repairing pores and cracks inside cement, when a cement-based material has the cracks of which the diameters are small than 0.4mm, insoluble sediment is generated in the cracks of the cement-based material in the presence of water to fill and seal the cracks of the cement-based material, and thus self-repairing of the cracksof the cement-based material is achieved.

The invention belongs to the technical field of functional coatings and particularly relates to a novel anti-pollution flashover coating for an ultra and super high voltage insulator. The novel anti-pollution flashover coating comprises, by mass, 40%-50% of room temperature vulcanized silicone rubber, 5%-10% of titanate coupling agent, 2%-6% of composite fire retardant, 5%-12% of modified composite reinforcing agent, 2%-4% of nano TiO2, 0.5%-1% of surface active agent, 1%-5% ofhexamethyldisilazane, 0.2%-0.5% of antifoaming agent, 0.3%-0.6% of catalyst, 0.3%-0.6% of cross-linking agent and the balance solvent. The prepared anti-pollution flashover coating is sprayed on the surface of the cleaned ceramic insulator, and the coating can be used after being naturally cured for 96 hours under the condition of 25 DEG C+/-2 DEG C and 40%-70% of RH. According to the anti-pollution flashover coating, after the sprayed anti-pollution flashover coating is completely cured, the contact angle is not smaller than 135 degrees.

The present invention provides a resin composition for an electrophotographic photoconductor having excellent image stability and abrasion resistance which comprises a polycarbonate resin and a polysiloxane group-containing A-B type block copolymer consisting of a polysiloxane group-containing copolymer segment-A formed by a vinyl monomer represented by the general formula (1) and a polysiloxane group-containing monomer and a polymer segment-B formed by a vinyl monomer represented by the general formula (1), wherein the content of said polysiloxane group-containing monomer is 10 to 85% by weight based upon said polysiloxane group-containing A-B type block copolymer, and the content of said polysiloxane group-containing A-B type block copolymer is 0.03 to 3 parts by weight based upon 100 parts by weight of said polycarbonate resin.

(In the formula (1), R₁ represents a hydrogen atom or a methyl group. R₂ represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or a hydroxyalkyl group having 2 or 3 carbon atoms.)

The invention discloses a repairing liquid of a lead-acid storage battery, which is prepared through the following steps: preparing materials according to the following formula (weight percent): 90-94.5% of de-ionized water, 2.5-4.0% of nano silicon nitride powder, 0.5-1.0% of poly N-vinyl pyrrolidone, 0.5-1.0% of polyethylene glycol, 0.5-1.0% of relative low molecular sodium polyacrylate dispersing agent, 0.5-1.0% of polyvinyl alcohol, 0.5-1.0% of polyethylene amide, 0.5-1.0% of preservative; placing the materials in a glass or enamel heating kettle, heating up to 80-85 DEG, preserving temperature to obtain a semitransparent solution so as to obtain the repairing liquid. The repairing liquid can effectively dissolve and remove the lead sulfate crystal on a battery polar plate, recovers the function of the polar plate, repairs the failed lead-acid storage battery, and forms a protecting film on the surface of the battery polar plate, so that the battery polar plate does not crystallize the lead sulfate, and the service life of the battery is prolonged.

The invention relates to a fluorine-silicon modified waterborne alkyd resin and a preparing method thereof. The fluorine-silicon modified waterborne alkyd resin is prepared from vegetable oil fatty acid, organic acid anhydride, polyol, fluorinated allyl monomers, isocyanate, hydroxyl-terminated organic silicon, acrylic monomers and deionized water. Single-component waterborne paint, double-component waterborne paint and room-temperature curing paint can be blended with the fluorine-silicon modified waterborne alkyd resin prepared through the method. The prepared fluorine-silicon modified waterborne alkyd resin has the performance such as high adhesion, stain resistance, high hardness, water resistance, durability, hydrophobicity and self-cleaning performance, and can be widely applied to waterborne wood paint, waterborne industrial paint, waterborne anti-fouling paint, waterborne corrosion resistance paint, waterborne special engineering paint such as radar dome materials, wind power generation, nuclear power and vessel paint and the like.

The invention discloses an anti-sticking coating. The anti-sticking coating comprises a bottom layer and a surface layer, wherein the bottom layer is used for binding a blank piece with the surface layer and positioned between the surface of the blank piece and the surface layer, the surface layer is positioned on the bottom layer, the surface layer comprises a powder matrix and a hard phase mixed in the powder matrix, the power matrix mainly comprises ferrum, nickel and chromium; and the hard phase comprises tungsten carbide, chromium carbide and the like. The anti-sticking coating adopts a structure that the coating is formed by combining the powder matrix taking ferrum, nickel and chromium as main substances and manganese, molybdenum, boron, silicon and cobalt as secondary substances, with the hard phase of large particle ceramic or metal ceramic such as tungsten carbide, chromium carbide with the size of larger than 5mu m, so that the surface free energy on the surface of the coating and the surface tension of the coating can be obviously reduced, the compatibility of plastic or other macromolecular material blank pieces with the coating can be reduced, the sticking possibility of the two can be greatly decreased, in addition, the coating can keep higher hardness at a high temperature, and overcome the defects that paint of Telfon and the like is not wear-resistant and easy to deform at a high temperature.

The invention provides an elastic antifouling aqueous fluorocarbon exterior wall paint. The paint comprises the following components, by weight, 16-20 parts of water, 15-27 parts of a self-crosslinking elastic acrylic emulsion, 12-22 parts of an aqueous fluorocarbon emulsion, 15-20 parts of titanium dioxide, 12-18 parts of barium sulfate, 4-8 parts of calcined kaolin and 1-1.4 parts of a film forming agent. In the invention, the self-crosslinking elastic acrylic emulsion is treated as a main base material to reach an anti-crack requirement, and the aqueous fluorocarbon emulsion having a good compatibility is matched for modifying to make a paint film having low surface free energy and a good lipophobic property in order to make the formed film compact, so the paint film cannot be polluted by blots, and can be easily cleaned after the blot pollution; and rutile and titanium dioxide are simultaneously combined to improve the weather ability, the chemicals (acid rain, salts and the like) corrosion resistance of the film, so the film has good color and light maintenance properties, thereby the elastic antifouling aqueous fluorocarbon exterior wall paint is a new high-performance elastic antifouling aqueous fluorocarbon exterior wall paint.

This invention pertains to a method of modifying polymeric coating materials by adding organosulfur compounds, so that the metallic substrates coated with the modified polymeric materials become more resistant to corrosion. The organosufur compounds are alkane thiols with a general formula R(CH₂)_nSH, where R represents H, NH₂, HOOC, and HO groups and n is in the range of 10 to 21. The reagents are designed to increase the adhesion between the polymeric coating materials and the metallic substrates, which may be conducive to increased corrosion resistance.

The invention discloses a preparation method of a pressure sensitive adhesive for a polaroid protection film and a protection film thereof. The pressure sensitive adhesive is prepared from the following raw materials in parts by weight: 10 to 40 weight parts of soft monomers, 5 to 15 weight parts of hard monomers, 2 to 6 weight parts of fluorine containing acrylate monomers, 0.8 to 3 weight partsof crosslinking monomers, 0.8 to 2 weight parts of vinylsilane, 0.5 to 2 weight parts of anti-static agents, 0.5 to 1.5 weight parts of initiators and 80 to 190 weight parts of solvents. The pressuresensitive adhesive can be directly covered on the surface of a polyester film; the additional addition of the curing agents and the anti-static agents is not needed; the adhesive layer resistance is 1010 ohm or less; the anti-static performance is realized. When the polaroid protection film adhesive layer is pasted on the surface of a polaroid, after the high-temperature and high-humidity tests for 500h, the protection film and the polaroid are tightly attached; no bubble bulges exist; no adhesive is remained when the protection film is torn away; defects such as hard shadow do not exist.

The invention discloses a ship corrosion preventing method. The ship corrosion preventing method comprises the following steps of steel plate surface pre-treatment, base material sanding treatment, weld joint and other structure defect repair sand blasting, priming paint coating, strengthening paint spraying, finishing paint spraying and follow-up maintenance. According to the ship corrosion preventing method, steel plate surface pre-treatment is performed before coating, an epoxy anticorrosive coating is sprayed on the position with high rust-proof requirement, and whole spraying is performed after spraying; during whole spraying, corrosion resistant polyurethane serves as film forming matter, a coating for a framework formed by sheet metal flakes does not contain precious metal and toxic components and is a novel environment-friendly coating, flakes are formed and distributed on the material surface, multiple layers of flakes are horizontally arranged in an overlapped mode, a path for a corrosive medium to permeate into a base material is prolonged, and the corrosion preventing performance of the coating is improved. The ship corrosion preventing method is short in technological process, and produced ships have excellent rust, corrosion and fouling preventing performance.

The invention discloses a bionic marine antifouling paint which comprises the following raw materials in parts by weight: 30-45 parts of fluorinated acrylic ester, 20-35 parts of silicone rubber, 2-10 parts of biological antifouling agent, 15-25 parts of filler, 0.5-1 part of organic bentonite, 0.5-1 part of polyethylene wax and 2-7 parts of propylene glycol. According to the bionic marine antifouling paint disclosed by the invention, P-cinnamate sulfate in the biological antifouling agent has a remarkably strong attachment inhibiting effect on marine bacteria and barnacle; homarine can prevent attachment of marine benthic diatom and barnacle; diterpene formamide has a function of inhibiting barnacle and shellfish larvae; the rubber silicon material and fluorinated acrylic ester material have extremely low surface free energy, low friction coefficient, high hydrophobicity and high contamination release performance, so that attachments are not easily attached or are insecurely attached.

To provide a semiconductive rubber member causing no substantial sticking of foreign matter represented by a toner outer additive for a long period through reducing the surface free energy of the rubber member while maintaining its electrical properties' uniformity and design values' repeated reproducibility, excellent in processability and substantially exhibiting no surface defects including molding unevenness and cracks. This semiconductive rubber member is obtained by compounding 100 pts. mass of an ionically conductive rubber including a rubber having polyether linkages with 0.1-5 pt(s). mass of a wax. In this rubber member, it is preferable that the rubber having the polyether linkages to be used consists of a polymer made from a halogen-containing ether-based monomer and, when desired, a halogen-free ether-based monomer and/or a copolymerizable unsaturated epoxide-based monomer.

The invention relates to a nano water-based fluorocarbon insulated elastic exterior wall paint which is characterized by comprising the following components: nano ATO powder, titanium dioxide, calcined kaolin, calcium carbonate, a nano zirconia dispersion liquid, cellulose, a self-crosslinking elastic emulsion, a fluorocarbon emulsion, a covering emulsion, hollow glass microbeads, auxiliary agents, and the balance being water. The paint has the advantages that a paint film has lower surface free energy and is endowed with a good oleophobicity; a paint film formed by adding the self-crosslinking emulsion is more dense so as to make the paint film less susceptible to contaminate by stains, and simultaneously is more easily washed cleanly after being contaminated by the stains; and finally, in cooperation with a proper amount of the hollow glass microbeads, the nano zirconia dispersion liquid, the nano ATO powder and other functional additives, the insulation, anti-cracking and antifouling requirements of people on exterior walls are satisfied, the paint film is not damaged after the stains are washed cleanly, and thus the novel high-performance weather-proof exterior wall emulsion paint is provided for exterior wall decoration.

The invention provides a method of silicon substrate III-V group nanowire area selection transverse epitaxial growth. The method comprises the steps of A, preparing the whole segment of silicon nanowire on a top silicon thin layer of a crystal face SOI substrate (110); B, removing the middle segment of the whole segment of silicon nanowire, and forming silicon crystal faces (111) on the end faces, facing the inner sides, of the reserved left segment of silicon nanowire and the right segment of silicon nanowire; C, transversely growing III-V group material nanowires between the two end faces, provided with the silicon crystal faces (111) and facing the inner side, of the left segment of silicon nanowire and the right segment of silicon nanowire in an area selection mode, and forming a heterojunction bridging structure. The characteristics that the silicon crystal faces (111) have the higher dangling bond density and the lower surface free energy are utilized by the method, and the area selection transverse growth of the III-V group nanowires can be achieved on the side walls of the silicon crystal faces (111) between the left segment of silicon nanowire and the right segment of silicon nanowire with the low cost.

A magnetic head includes a head slider configured to float above a recording medium and having an element part for recording to and reproducing from the recording medium, the element part being situated on a medium facing surface facing to the recording medium. The medium facing surface has a first air bearing surface situated in a vicinity of a side of an air flow-out end. The medium facing surface has a rear rail having the element part situated at the side of the air flow-out end of the first air bearing surface. The first air bearing surface is covered with a lubricating layer made of water repellent resin and has an average surface roughness larger than an average surface roughness of a surface of the element part.