136results about How to "Chemically inert" patented technology

The invention belongs to the technical field of production of sodium copper chlorophyllin and in particular relates to a method for producing sodium copper chlorophyllin through supercritical purification. The method for producing sodium copper chlorophyllin through supercritical purification comprises the following steps: (1) saponifying; (2) washing; (3) copperizing; and (4) purifying, namely purifying copperized chlorophyll by adopting supercritical carbon dioxide; and (5) obtaining the finished product. According to the method, the copperized chlorophyll is purified by adopting a supercritical technology, the particularity of a molecular structure of chlorophyll derivatives is overcome, and the yield of the copperized chlorophyll is greatly improved, so that the process of producing the sodium copper chlorophyllin is efficient and friendly to the environment.

The invention provides a full contact test circuit for a TFT (Thin Film Transistor) array substrate, which is characterized in that a test chip (5) is arranged outside a panel cutting boundary line (7), the size of each test terminal (51) on the test chip (5) and the distance between the adjacent test terminals (51) are allowed to be increased, and the success rate of enabling test equipment to becontacted with the test terminals (51) can be improved; the test chip (5) is cut off during panel cutting, wires (35) connecting the test terminals (51) and driving terminals (31) on a driving chip (3) are made of a conductor (S) located at the same layer with an active layer of a TFT in the TFT array substrate, and the risk of line corrosion and electrostatic discharge occurred after panel cutting can be prevented; and the test terminals (51) need not to be covered with an insulating organic layer because the test chip (5) is cut off during panel cutting, so that the test is allowed to be performed both after the source / drain electrode of the TFT in the TFT array substrate is manufactured and under a condition that the whole TFT array substrate is manufactured.

The invention discloses a preparing method of artificial intervertebral disc nucleus pulposus prosthesis in the macromolecular technical domain, which comprises the following steps: preparing polyurethane bag material; blending the polymer dihydroxy alcohol and diisocyanate; stirring the composition protected by nitrogen to make the prepolymer; heating to add chain-expanding cross linker; stirring to react; maturing; moulding the polyurethane bag; preparing the silicon rubber filler through blending base gel, cross linker, filler and catalyst to stir evenly; injecting the silicon rubber filler into the polyurethane bag through injector. The invention doesn't harm human body with good biological compatibility and dynamic property, which has chemical inert to possess long-term mechanic strength.

The invention discloses a low-surface-energy water-based epoxy anticorrosive coating and preparation and application thereof. The molecular structure of the coating contains structures such as epoxy groups, polyether, silicon fluoride and graphene; in the stage of emulsifying epoxy resin of the coating, the coating has excellent aqueous property and high emulsifying capability owing to a self-emulsifying aqueous epoxy curing agent, the coating has good compatibility with the epoxy resin, and the stability of emulsion is improved. In a curing stage of modification of a graphene oxide modified coating, it is ensured that the self-emulsifying water-based epoxy curing agent does not separate out from a coating layer to form a stable coating layer; a flexible micro-region is formed by flexiblelong-chain polyether in the coating layer, so that the mechanical property of a coating film is improved; by silicon-fluorine sol, the surface energy of the coating film is reduced; graphene is grafted into the molecular structure through chemical bonds, after the dispersion performance is improved, the graphene can cover a metal surface efficiently, and the corrosion resistance of the coating layer is improved. Therefore, the coating provided by the invention has excellent properties of adhesion, hardness, acid and alkali resistance, water resistance and the like after film formation, variouscomponents are compatible well, and the coating can be used for metal parts and the like.

The invention relates to a transparent packaging film and a preparation method thereof. The transparent packaging film comprises an NY (nylon) film layer, an adhesive layer and a PE-NY (polyethylene-nylon) co-extrusion film which are tightly bonded, wherein the PE-NY co-extrusion film layer consists of a corona layer, a first adhesive layer, a middle layer, a second adhesive layer, a first heat sealing layer, a second heat sealing layer and a third heat sealing layer which are sequentially adhered together; the corona layer comprises 66.7 to 66.8wt% of linear low density polyethylene, 33.1 to33.3wt% of high-pressure low density polyethylene and 0.04 to 0.05wt% of fluoride processing additive; the first adhesive layer and the second adhesive layer comprise polyethylene bonding resin; the middle layer comprises copolymerizing nylon; the first heat sealing layer and the second heat sealing layer comprise metallocene polyethylene; the third heat sealing layer comprises 95 to 97wt% of metallocene polyethylene, 2 to 3wt% of smoothing agent and 1 to 2wt% of opening agent. The transparent packaging film is a composite film with good heat sealing and packaging adaptability.

The invention discloses an environment-friendly fireproof coating and a preparation method thereof, and relates to the field of building coatings. The environment-friendly fireproof coating is prepared from the following raw materials: a macromolecular emulsion film forming matter, an inorganic film forming matter, an intumescent organic flame retardant, a non-intumescent inorganic heat-insulating filler, an intumescent inorganic heat-insulating filler, reinforced fibers, nano rare earth oxide, a coupling agent, a coalescing agent, a dispersing agent, a thickening agent, a pH regulator, deionized water and the like, wherein the intumescent organic flame retardant is an intumescent flame retardant containing N-P cage type macromolecules. The coating is excellent in fireproof performance, high in expansion multiple and fireproof performance, long in fire-resistant time and excellent in waterproof performance. The invention further discloses a preparation method of the environment-friendly fireproof coating.

The invention discloses a high temperature resistant coating and a preparation method thereof. The high temperature resistant coating is composed of an A component and a B component, wherein the A component is as follows: 65-68 parts of acrylic resin, 42-45 parts of bisphenol A epoxy resin, 20-25 parts of castor oil, 18-24 parts of mica powder, 12-16 parts of benzyl silicon resin, 20-25 parts of silicone resin, 2-4 parts of defoaming agent, and 45-50 parts of solvent; the B component is as follows: 2-4 parts of rust-inhibiting additive, 10-12 parts of flatting agent, 2-5 parts of catalyst, 8-12 parts of pigment, and 11-13 parts of surfactant. The invention further provides the preparation method of the coating. The coating is not only strong in high temperature resistance and good in fire prevention and corrosion resistance, but also good in adhesion and hard to fall off; the coating is small in surface friction coefficient, friction resistant, various in colors, long in service life, wide in use range, environment-friendly and lowered in cost.

The invention provides a preparation method of mixed egg liquid. The preparation method comprises the following steps: (1) poultry eggs are disinfected, aired and broken to obtain egg liquid; (2) additives of sodium caseinate, sodium carboxymethylcellulose, hydroxypropyl starch and maltodextrin are added; (3) high-density carbon dioxide treatment is conducted on the egg liquid, and the treatment temperature is 38-42 DEG C; a high-density CO2 environment is formed in a treatment kettle; the treatment lasts for 20 minutes under 20 MPa; (4) the pressure is relieved after the treatment is finished; the egg liquid is taken out, and put in ice water for cooling, and then stored under the condition of 2-4 DEG C. The preparation method adopts the high-density CO2 cold disinfection mode to treat the mixed protein liquid, and regulates the disinfection treatment conditions according to the egg liquid properties; the used carbon dioxide has of properties of chemical inertness, no corrosion, high volatility and unique economy, so that energy is saved; as the disinfection and enzyme deactivating are conducted under the condition of low temperature, the qualities of nutrition, flavor and freshness and the like of the mixed protein liquid are kept to the maximum extent; compared with pasteurization, the disinfection method has the advantages that the shelf life of the mixed egg liquid is longer.

The invention relates to a preparation method of a diatomite and paraffin composite phase change material. The preparation method comprises the following steps: dissolving a phase change material paraffin in petroleum ether in a water domain at a certain temperature and stirring; then, adding a carrier diatomite with nanoscale porous structures, and continuously stirring, so that the porous structures of diatomite can be fully contacted with the phase change material to adsorb sufficient paraffin; and then, raising the temperature of the water domain to 75 DEG C, evaporating the solvent petroleum ether, then condensing and recovering the solvent petroleum ether and drying to obtain a powder composite energy storage material. The composite phase change material provided by the invention is not changed in shape in the phase change process, and paraffin is not leaked. Moreover, the composite phase change material is simple in preparation process, low in cost and energy-saving and environmentally friendly, and the solvent can be recycled.

The invention discloses silyl ether mixed defoaming agent emulsion and a preparation method thereof. The silyl ether mixed defoaming agent emulsion is prepared from the following components: linear simethicone, allyl ether modified polysiloxane, polyoxypropylene glyceryl ether, modified white carbon black, triethanolamine and a compound emulsifier. The preparation method comprises the following steps: uniformly mixing the linear simethicone and the modified white carbon black, and heating to obtain a mixture I; adding triethanolamine into the mixture I, stirring and cooling to obtain a mixture II; adding the allyl ether modified polysiloxane and the polyoxypropylene glyceryl ether, and further stirring to obtain a mixture III; adding the compound emulsifier into the mixture III, and stirring at high speed to obtain coarse emulsion; adding thickening water into the coarse emulsion, and preparing raw emulsion; and pouring the raw emulsion into a high-speed homogenizer for stirring to obtain the fine-smooth and stable emulsion. The defoaming agent easily dissolves in water, and is small in specific surface area, high in defoaming speed, lasting in foam inhibition and small in use amount; the preparation method is convenient and easy to operate; the defoaming agent has no toxic effects on microorganisms, has an effect of promoting the growth of mycelia, is beneficial to microbial fermentation and is relatively environmentally friendly.

The invention discloses a preparation method and a construction process for a colorful polyurethane plastic track, and belongs to the technical field of sports facilities. The preparation method for colorful polyurethane plastic comprises the following steps: uniformly stirring 10 to 15 parts of polyether polyol, 10 to 30 parts of hydroxylated acrylic resin, 10 to 30 parts of paraffin, 2 to 4 parts of a chain extender and 0.1 to 0.5 part of an age resistor, and raising temperature to 90 to 100 DEG C; adding 30 to 50 parts of a filler, 2 to 9 parts of a pigment and 0.1 to 0.5 parts of an age resistor, and performing uniform stirring; starting a colloid grinder to grind the materials into particle sizes of smaller than 400 meshes; continuing heating, and performing dehydration for 2 to 3 hours under the conditions of temperature of 90 to 100 DEG C and vacuum degree of lower than 0.095Mpa. According to the preparation method and the construction process, with the adoption of the high-functionality polyether polyol, reaction is accelerated, the hardness of a formed film is increased, and construction time is shortened; by the hydroxylated acrylic resin, high glossiness and higher weather resistance and color retention are achieved, and the service life is prolonged.

The invention discloses an environment-friendly separant for a rubber film, a separant solution and a separant coating process. The environment-friendly separant is composed of, by mass, 40-50 parts of zinc stearate, 35-45 parts of talcum powder and 10-20 parts of paraffin oil. During conventional rubber processing, serious dust pollution is caused by adopting a mode of direct coating of talcum powder, and film performance of rubber is affected due to nonuniform coating. The environment-friendly separant is low in formula cost, uniform in coating and good in film separating effect, and the separant coating process is simple, convenient, feasible and free of dust pollution.

The invention discloses a preparation method of a novel medicinal transdermal penetration enhancer, and relates to a synthesis method of liquid hydrogenated polyolefin. The method includes the steps of catalyst preparation, olefin catalytic polymerization and polyolefin hydrogenation. Polyolefin obtained through the method is colorless, tasteless and nontoxic, has the characteristics of high chemical stability, chemical inertness and high permeability, has no irritation or discomfort to skins as a transdermal absorption enhancer, has good compatibility with the skins, has no pharmacological activity, is suitable for medicines of all transdermal absorption dosage forms, and is a novel transdermal absorption enhancer.

The invention discloses a low-permeability fluororubber product material which comprises the following raw materials in parts by weight: fluororubber, calcium silicate, magnesium oxide, calcium hydroxide, WS280, iron oxide red, modified molybdenum disulfide, nano inorganic filler, modified diatomite and modified white carbon black. Preparation of synthetic rubber comprises steps of feeding all the raw materials into an internal mixer according to the weight parts, detecting the hardness, strength and elongation of the synthetic rubber after the synthetic rubber is obtained through the internal mixer, and filtering after detection, carrying out open milling molding on the qualified synthetic rubber through an open mill at 60-70 DEG C, putting the molded rubber into a mold in vulcanization equipment, and carrying out vulcanization treatment on the rubber. The low-permeability fluororubber product material which is excellent in flowability, improved in demolding performance, relatively good in methanol and ethanol fuel oil resistance and good in compression stress relaxation is prepared through the procedures of preparation of synthetic rubber, molding and vulcanization of the rubber, secondary vulcanization aftertreatment and the like.

The invention relates to an auxiliary material for lamination of a flexibility circuit board and lamination process of the same. The auxiliary material (4) for lamination of the flexibility circuit board comprises the following layers: heat-resistant release film (1), a filling and coating material (2) and a deformation control material (3), wherein the heat-resistant release film (1) is fluorinated ethylene propylene or polytetrafluoroethylene film; the filling and coating material (2) comprises the following components: crylic acid alkyl ester polymer, polysiloxane and polyethylene; the deformation control material (3) comprises PET, PBT or PA film; and at least two adjacent layers of the heat-resistant release film (1), the filling and coating material (2), the deformation control material (3) are composited into a whole or three layers are composited into a whole. The invention solves the problem that foreign body plug the hole; and the special filling and coating material can not escape in cross flow in the process of the lamination. The invention also provides a lamination process with excellent glue resistance capability.

The invention relates to a modified organic silicon polymer paint for preventing a power transmission wire from covering ice and a preparing method thereof. The paint comprises the following components in parts by weight: 40-50 parts of functional polymer, 45-55 parts of functional vacuum cenospheres wrapped by fluorinated siloxane, 1-2 parts of functional auxiliary, 0.1-0.3 part of defoaming agent and 2-5 parts of polytetrafluoroethene emulsion wax. Compared with the prior art, the invention has the advantages of low surface tension, high hydrophobicity, high self-lubricity, low bonding property to ice, proper heat absorption, insulating and storage property, excellent adhesion to a cable, excellent outdoor use durability, refractory, environment-friendly and non-toxic film forming matter and the like.

A preparation process of oridonin fine particles is characterized by comprising the following steps: (1) preparing oridonin solution; (2) connecting the oridonin solution prepared in the step (1) with a solution pump; (3) charging carbon dioxide; (4) jetting the oridonin solution into a crystallization reactor by a nozzle in a supercritical fluid anti-solvent equipment system through the solution pump; and (5) separating out the oridonin crystals. The oridonin fine particles prepared by the process are characterized in that the particles are loose amorphous white superfine powder; and the particle size d (0.5) is 5.135um. The process is suitable for the superfine oridonin powder, improves the medicine dissolution and the curative effects and is used for preparing the oridonin fine particles by applying the supercritical fluid crystallization technology.

The invention discloses indoor antibacterial and environment-friendly water paint for removing formaldehyde and a preparation method thereof, the indoor antibacterial and environment-friendly water paint is prepared by proportioning of water-based self-crosslinking polyacrylic acid resin emulsion, deionized water, a silver ion solution, rutile titanium dioxide, Maya blue, nano silica, a thickening agent, 2,2,4-Trimethyl-1,3-pentanediolmono(2-methylpropanoate) film-forming additive and other raw materials according to a certain weight ratio, grinding, dissolving, stirring, mixing and other a series of operations, the indoor antibacterial and environment-friendly water paint is environment-friendly water paint which has a very strong sterilization function, is safe and pollution-free, can easily adsorb the formaldehyde and other harmful gases, can minimize the reduction of damage of natural environment pollution to human health, and is suitable for decoration of hospitals, places of entertainment, theaters and other public places and family indoor decoration.

The invention discloses a corrosion-resistant water-borne coating. The components of the corrosion-resistant water-borne coating include in parts by weight: 40 to 45 parts of acrylic resin, 20 to 23 parts of bisphenol-A epoxy resin, 5 to 8 parts of potassium methylsilanol, 7 to 9 parts of magnesium stearate, 10 to 15 parts of epoxy-modified organic silicone resin, 8 to 12 parts of silicon carbide, 12 to 15 parts of titanium dioxide, 20 to 30 parts of deionized water, 35 to 40 parts of water, 5 to 8 parts of alkyd resin, 15 to 18 parts of talcum powder and 3 to 4 parts of propylene glycol monomethyl ether. Not only is the corrosion resistance of the coating good, but also the adhesion is good, so the coating cannot easily shed; the surface friction coefficient of the coating is small, so the coating can resist abrasion; moreover, colors are diversified; the service life is long, and problems, such as blistering, cracking, whitening and even leafing, cannot take place after the coating is used for a long time; moreover, the coating can be used under harsh environments, so the range of application is wide.

The invention discloses an immobilized tungsten trioxide nanosheet array and a preparation method and application thereof. The preparation method comprises the steps that a tungsten source is dissolved in an organic solvent to obtain a precursor solution with the molar concentration of tungsten ions being 0.02-0.08 mol / L, then a substrate material is placed in the precursor solution, and a heatingreaction is conducted after sealing to obtain the immobilized tungsten trioxide nanosheet array. According to the one-step solvothermal method provided by the invention, the immobilized tungsten trioxide nanosheet array is prepared on a substrate material, a template agent, a shape control agent and a seed crystal layer are not introduced, the process is simple, green and environment-friendly, the raw materials are easy to obtain, the cost is relatively low, and the operability is high; the used substrate material is single-sided frosted glass, is easy to obtain and low in cost, has chemicalinertness and mechanical stability, and can bear high temperature; and the prepared immobilized tungsten trioxide nanosheet array is good in crystallinity, stable in morphology, uniform in size distribution, good in photocatalytic performance and convenient to recycle, and the environmental problem caused by a powdery nano tungsten trioxide material can be well solved.

The invention provides an electrocardiogram conductive connecting line electrode. The electrocardiogram conductive connecting line electrode comprises a conductive connecting line, an electrode piece and a contact label, wherein the electrode piece is provided with silver foil or silver foil processed through silver chloride, non-woven fabric and conductive hydrogel layers, wherein the non-woven fabric and the conductive hydrogel layers are arranged on two sides of the silver foil and bonded together, the non-woven fabric is provided with a welding opening at the position of the silver foil, and the tail end of the conductive connecting line is welded to the silver foil at the position of the welding opening; the contact label is stuck to the non-woven fabric and covers the welding opening and the tail end of the conductive connecting line. According to the electrode piece, the silver foil is used as the electrode, the electrode and the conductive line are firmly connected in a welding mode, the thickness of the electrode is smaller than 1.2 mm, separation between applied materials of the non-woven fabric and conductive hydrogel of the electrode piece is reduced, and separation of the conductive hydrogel and loaded PET solves the problem of upwarping of the label. The electrode piece is unlikely to fall off in the use process, the electrocardiogram monitoring effect is improved, accurate data are provided for clinical medication and rescue, the success rate of treatment and rescue is improved, and the cost is reduced.

The invention discloses a metal ceramic coating continuous casting crystallizer copper plate and a preparation method thereof, and belongs to the technical field of continuous casting crystallizer surface treatment. The preparation method comprises the following steps that a copper plate is straightened to undergo oil removal; an HVAF spraying system taking air as a combustion improver is started,sand blasting preheating is carried out, then a spraying process program is started, ignition is achieved, a spraying material of WC-17Co powder is supplied, and a metal ceramic layer is sprayed on the preheated copper plate to obtain a copper plate with the metal ceramic coating; and a three-layer hole sealing process is adopted for carrying out hole sealing on the surface of the copper plate, and then surface layer curing is carried out on the copper plate, wherein the hardness of the obtained metal ceramic coating is HV1250-HV1400, the porosity is less than or equal to 1%, and the bindingforce of the metal ceramic coating and the continuous casting crystallizer copper plate is greater than or equal to 70 MPa. Therefore, the prepared metal ceramic coating continuous casting crystallizer copper plate is high in coating hardness, small in brittleness, low in porosity and high in binding force.

The invention discloses a silicon carbide-based composite circuit board and a preparation method thereof and belongs to the technical field of circuit boards. The silicon carbide-based composite circuit board comprises a silicon carbide-based composite base board and a circuit printed on the silicon carbide-based composite base board, wherein the silicon carbide-based composite circuit board is prepared from raw materials of, by weight part, 50-60 parts of silicon carbide, 20-28 parts of glass powder, 5-10 parts of filler, 3-7 parts of adhesives and 7-12 parts of additives. The silicon carbide-based composite circuit board is prepared by taking the silicon carbide and the glass powder as the main component and matching with the filler, the adhesives and the additives through ball milling,ultrasonic treatment, spray granulation and three sintering processes. Through dispersion and adhesion of the raw materials, the prepared silicon carbide-based composite base board can be low in thermal expansion coefficient, high in mechanical strength, good in stability and capable of effectively improving the qualification rate, thereby being high in promotional significance.

The invention discloses a modified activated carbon compound adsorption treatment material for wastewater treatment. The material comprises the following raw materials in mass percent: 30 to 50 percent of modified activated carbon, 10 to 25 percent of granular expanded graphite, 5 to 10 percent of glass beads, 5 to 15 percent of hollow brick particles, and 15 to 35 percent of a composite flocculant aid. According to the compound adsorption treatment material, modified activated carbon is adopted for being compounded with the granular expanded graphite, the glass beads, the hollow brick particles and the composite flocculant aid according to reasonable mass ratio, so that heavy metal ions and organic and inorganic pollutants in raw water can be effectively removed and the contents of COD, SS, BOD and sulfide in the raw water can be reduced; the raw materials adopted are nontoxic, have chemical inertness, and cannot cause secondary pollution in water; the raw materials adopted can be reused after regeneration treatment, so that the wastewater treatment cost is greatly reduced, and the material is beneficial to the development of the application of activated carbon to the wastewater treatment industry.

The invention relates to a surface corrosion preventing and protecting coating and particularly relates to high-performance water-based jet ink for polyethylene and a preparation method of the high-performance water-based jet ink. The high-performance water-based jet ink comprises the following components in parts by mass: 10-30 parts of acrylic resin, 25-45 parts of ethylene glycol, 2-15 parts of butyl acetate, 0.8-4.5 parts of an emulsifying agent, 2-4 parts of silicon dioxide, 5-10 parts of a bactericide and 8-15 parts of direct black, wherein acrylic resin is modified chlorinated polypropylene resin, the emulsifying agent is a mixture of 45-75% polyoxyethylene sorbitan monolaurate and 25-55% polyoxyethylene bisorbitan monolaurate, and silicon dioxide is hydrophilic gas-phase silicon dioxide. The high-performance water-based jet ink is relatively long in service life and high in use safety; multiple performance tests prove that the high-performance water-based jet ink has excellent adhesive force, wear resistance, weather resistance as well as favorable salt mist resistance, damp and heat resistance and flexibility.

The invention discloses a water-based nano thermal insulation coating and a preparation method thereof, during preparation, the coating prepared from components such as an acrylic polyurethane emulsion, a dispersing agent, a defoaming agent, a wetting agent, a coalescing agent, a pH regulator, a thermal insulation filler and the like has excellent thermal insulation performance; according to the scheme, fluorine and silicon monomers are introduced into the acrylate emulsion during preparation, so that the corrosion resistance of the coating can be improved, the hydrophobicity and the chemical medium resistance of the coating are excellent, the crosslinking sites between the coatings can be improved, the crosslinking density of all the components is improved, the adhesive force of the coating and a base material can be improved, and the corrosion resistance of the coating is improved. And the barrier property to corrosive media is further improved. The process design is reasonable, the component proportion is appropriate, when the coating is applied to the surface of a pipeline, the heat preservation and heat insulation effect is excellent, the coating surface is hydrophobic, the corrosion resistance is excellent, and high practicability is achieved.

The invention discloses a solvent-resistant inert resin coated fluororubber sealing rubber plug and a manufacturing method thereof. The sealing rubber plug comprises the following raw materials: fluororubber, a reinforcing agent, a filling agent, a processing aid, an acid acceptor and a cross-linking agent system, wherein the sealing rubber plug further comprises a fluorine resin film which coversthe neck part of the sealing rubber plug and is subjected to corona discharge treatment; the thickness of the fluorine resin film is 5-100 [mu]m, and the fluorine resin film is one of an ethylene-tetrafluoroethylene copolymer film, a tetrafluoroethylene-perfluoropropyl perfluorovinyl ether copolymer film, a chlorotrifluoroethylene polymer film and a polyvinylidene fluoride film. The preparation method comprises the following steps: rubber material mixing, primary sheet discharging, fluorine film slicing, primary laminating vulcanization, primary punching, secondary sheet discharging, secondary vulcanization and secondary punching. The surface, in contact with a solvent, of the sealing rubber plug is coated with a layer of an inert film, low-molecular-weight organic matters in rubber can be prevented from migrating to the solvent end, the influence of dissolved matters on an organic solvent is avoided, and inaccuracy of a detection result is avoided.

The invention discloses a method for increasing yield of lost foam casting of engine cylinder blocks, and belongs to the technical field of lost foam casting of engine cylinder blocks; the problem to be solved is that a method for increasing casting yield of lost foam casting of engine cylinder block is provided; the adopted scheme is that: according to the method for increasing yield of lost foam casting of engine cylinder blocks, a coating for lost foam casting is coated on a surface of a lost foam, and dried; small holes and / or water channels on the lost foam of an engine cylinder block are filled solidly with resin sand; and the prefilled resin sand is tamped at a pressure intensity of 1.2-8*105 Pa; the invention is widely applicable to fields of various lost foam casting of engine cylinder blocks.

The invention relates to a bio-based bright water-based clear topcoat with a lotus effect. The bio-based bright water-based clear topcoat comprises the following components in parts by weight: 55.0-80.0 parts of bio-based fluorine-modified water-based polyurethane resin, 2.0-5.0 parts of an antifreeze agent, 0.1-0.4 part of a substrate wetting agent, 1.0-6.0 parts of a film forming additive, 0.1-0.5 part of a defoamer, 0.1-0.6 part of a pH adjuster, 0.2-0.6 part of a leveling agent, 0.2-0.8 part of a thickener, and the balance of deionized water. The bio-based bright water-based clear topcoatwith the lotus effect prepared in the invention has excellent adhesion, abrasion resistance, water resistance, corrosion resistance, aging resistance and stain resistance, high gloss, lotus effect, biodegradability and environmental protection, and can be coated on surfaces of woodware, plastic, paper, aluminum and alloy, copper and alloy, and steel structures.

The invention belongs to the field of hydrofluoroethers, in particular to a hydrofluoroether compound and a preparation method and an application thereof. The hydrofluoroether compound is representedby that follow formula: F [CF(CF3)CF2O]<x>-R<H>; where x = 2-7; RH=CH3, C2H5, n-C3H7 or i-C3H7. The hydrofluoroether compound provided by the invention only contains fluorine, the only halogen element, does not contain ozone-destructive substances, and is an environmentally friendly non-flammable heat transfer agent, a solvent and a cleaning agent.