54results about How to "Prevent cracking and falling off" patented technology

The invention discloses a square steel confined concrete arch center wall back filling bolting-grouting support system and a construction method. The square steel confined concrete arch center wall back filling bolting-grouting support system comprises high-strength anchor rods, grouting anchor rods, grouting anchor cables and multiple square steel confined concrete arch centers, wherein adjacent square steel confined concrete arch centers are connected through longitudinal beams, anchor rod holes are formed in the longitudinal beams, longitudinal beam anchor rods penetrate the longitudinal beams through the anchor rod holes to be anchored into a surrounding rock, a wall back filling layer is arranged between the square steel confined concrete arch centers and the surrounding rock, and the square steel confined concrete arch centers, the wall back filling layer and the tunnel surrounding rock are connected through the longitudinal beam anchor rods. The high-strength anchor rods, the grouting anchor rods and the grouting anchor cables are constructed before the square steel confined concrete arch centers are erected. The square steel confined concrete arch center wall back filling bolting-grouting support system and the construction method are applicable to supporting of underground projects including weak broken surrounding rock tunnels and the like, the square steel confined concrete arch center wall back filling bolting-grouting support system has the advantages of being high in strength, good in stability, reasonable in stress and the like, and the square steel confined concrete arch center wall back filling bolting-grouting support system and the construction method can effectively improve the primary supporting strength after tunnel excavation and ensure the stability of the tunnel surrounding rock.

The invention discloses a nonstick coating containing a graphene material. The nonstick coating is formed by a bottom layer and a surface layer; the bottom layer comprises, by weight, 50-90 parts of apolytetrafluoroethylene / polysulfone blend, 0.5-2 parts modified graphene oxide, 1-5 parts of a thermochromic pigment, 0.8-1.2 parts of modified silicon carbide whiskers, 1.5-3 parts of an additive and 15-35 parts of deionized water; and the surface layer comprises, by weight, 35-75 parts of polytetrafluoroethylene resin, 1.5-5 parts of modified calcium carbonate whiskers, 3-8 parts of fatty alcohol polyoxyethylene ether ammonium sulfate, 5-10 parts maleic anhydride and 35-60 parts deionized water. Different raw material components of the bottom layer and the surface layer are reasonably combined, so the obtained nonstick coating has the advantages of good over-temperature prompting function, facilitation of control of the cooking heat, excellent high temperature wear resistance, and prolongation of the service life of a nonstick pan.

The invention discloses a method for preparing a terminal shell, the terminal shell and a mobile terminal. The method for preparing the terminal shell comprises the steps that a coating layer is formed on the outer surface of a shell substrate through a vacuum electroplating method; a protection film is formed on the coating layer; the shell substrate with the protection film is pressed or heat-formed, so that the shell substrate has the preset shape; a color gradient layer is formed on the inner surface of the formed shell substrate; the shell substrate with the color gradient layer is processed, and the terminal shell is obtained. Therefore, cracking and falling caused by high temperature or high pressure to the color gradient layer in the shell forming process can be avoided, the methodis simple, the shell preparation effect is good, and the yield is high.

The invention discloses an organic-inorganic composite coating material with a self-cleaning function. The organic-inorganic composite coating material is prepared through the following steps that nanometer titania sol, silica sol and Bola type silane coupling agents react; then, pigment and auxiliary agents are added, so that the organic-inorganic composite coating material with the self-cleaningfunction is prepared, wherein the mass ratio of the silica sol to the Bola type silane coupling agents is (0.2 to 0.5):1; the consumption of the nanometer titania sol is 3 to 10 percent of the totalmass of the silica sol and the Bola type silane coupling agents. A formed coating has high tenacity; cracking and falling cannot easily occur; good self-cleaning capability is realized; the clean appearance can be maintained in the long-time use process.

The invention provides an automobile sheet metal welding post-treatment process. The automobile sheet metal welding post-treatment process can solve the following problems that a, in the welding seamtreatment process of an existing sheet metal piece at a certain angle, pressure is prone to be caused on the sheet metal piece which is opened, then due to the fact that the sheet metal piece is extruded or stretched, the welding seam is cracked, or, the sheet metal piece is deformed and the like; and b, the welding seam of the sheet metal piece with the certain angle is difficult to clean, moreover, welding slag generated in the cleaning process is scattered around the welding seam, so that the welding seam cleaning difficulty is increased, and the cleaned welding seam is prone to be influenced and the like.

The invention relates to the technical field of thermally conductive adhesives and discloses a thermally conductive adhesive with high glass transition temperature and a preparation method thereof. The thermally conductive adhesive is prepared from the following raw materials (by mass): 5-80% of an organic silicon epoxy prepolymer; 1-50% of cycloaliphatic epoxy resin; 1-20% of an oxetane monomer,0-20% of macromolecular polyol, 0.2-25% of a curing agent, 0.1-2% of an antioxidant, 0.1-0.5% of a light stabilizer, 0.0-0.5% of a defoaming agent, 5-90% of a thermally conductive filler, 0.0-5% of adispersing agent and 0.2-2% of a coupling agent, wherein the sum of the components is 100%. The thermally conductive adhesive provided by the invention has high glass transition temperature (higher than 100 DEG C), higher elastic modulus (higher than 1000MPa), better toughness (the elongation is higher than 5%) and higher binding power; the thermally conductive adhesive is suitable for bonding anoptical fiber ring in an optical fiber gyroscope, the overall heat conductivity coefficient of the optical fiber ring can be effectively improved, the temperature gradient of the optical fiber ring isreduced, the full-temperature error of the ring is reduced, and the precision of the gyroscope is improved.

The present invention relates to a template, which comprises a plate body and two angle steel columns. The plate body is wooden, and the two angle steel columns are metal long rods and connected to two sides of the plate body. The two end sheets and a side body of each angle steel column are provided with connection holes used for connecting other templates. The two angle steel columns enhance the rigidity and support of the wooden plate body, while maintaining the flatness of the plate body, and provide longer service lifetime. The wooden plate can also be replaced in order to save material and cost.

The invention relates to a medical mask comprising a nanoscale photocatalyst functional layer. The medical mask comprises an upper cotton yarn layer and a lower cotton yarn layer, wherein an accommodation cavity is formed between the upper cotton yarn layer and the lower cotton yarn layer; a sterilization layer is placed in the accommodation cavity; and photocatalyst nano powder for sterilizationis wrapped in the sterilization layer. The medical mask comprises the upper cotton yarn layer and the lower cotton yarn layer; the accommodation cavity is formed between the upper cotton yarn layer and the lower cotton yarn layer; the photocatalyst nano powder is placed in the accommodation cavity; since adhesive layers are arranged on the sides, facing towards the accommodation cavity, of the upper cotton yarn layer and the lower cotton yarn layer; and the accommodation cavity is filled with the photocatalyst nano powder.

The invention discloses a sound-absorption, heat-insulation and fireproof building wall which comprises a wall and an inorganic material heat-insulation layer. The inorganic material heat-insulation layer is mounted on the outer side of the wall, a fireproof layer is arranged between the wall and the inorganic material heat-insulation layer, a sound-absorption plate is arranged between the fireproof layer and the wall, a facing layer is arranged on the side, which is far away from the fireproof layer, of the inorganic material heat-insulation layer, the inorganic material heat-insulation layer 3 is made of inorganic material micro-spheres which are coated on the surface of the side, which is far away from the wall 1, of the fireproof layer 4, and reinforcement meshes are arranged on the surfaces of two sides of the sound-absorption plate. The sound-absorption, heat-insulation and fireproof building wall has the advantages of sound-absorption, heat-insulation and fireproof properties.

The invention relates to an outer heat-insulation system of an outer wall. The outer surface of a basal layer wall body (1) is sequentially provided with an interfacial agent processing layer (2-1), a bonding mortar layer (3), a polyphenyl plate heat-insulation layer (4), a interfacial agent bonding layer (2-2), a first flexible heat- insulation putty layer (6-1), a second flexible heat- insulation putty layer (6-2), a closed base paint layer (7), an elastic heat- insulation coating layer (8) and a mat coat varnish layer (9) from inside to outside, wherein the first flexible heat- insulation putty layer (6-1) is internally provided with glass fibre gridding cloth (5); and all the layers are combined with the basal layer wall body (1) into a whole after being dried and solidified; flexibleheat-preserving putty of the two flexible heat-preserving putty layers, which contains 20-40 percent of heat-preserving materials, is formed, and elastic heat-preserving coating of the elastic heat-preserving coating layer (8), which contains 5-15 percent of heat-preserving materials, is formed. The outer heat-preserving system can prevent the polyphenyl plate heat- insulation layer (4) from cracking and desquamating caused by external temperature difference because of the heat preservation and isolation of the flexible heat- insulation putty layers and the elastic heat-preserving coating layer (8), thereby prolonging the service life of the heat-preserving system and enhancing the energy-saving effect of buildings.

The invention discloses a sandwich heat insulation reinforced concrete shear wall and a construction method thereof, belonging to the technical field of heat insulation walls and construction methods. The sandwich heat insulation reinforced concrete shear wall is characterized in that a first fixing mesh and a first vibration strengthening mesh are sequentially arranged in parallel at the outer side of a first heat insulation layer at intervals; a first connecting drawing wire is arranged in the first heat insulation layer, the inner end of the first connecting drawing wire is inserted into abearing wall body, and the outer end of the first connecting drawing wire is fixed with the first fixing mesh and the first vibration strengthening mesh; and a first outer template jack screw penetrating through a first outer protective layer is connected between the first fixing mesh and the first vibration strengthening mesh. When concrete is poured, a heat insulation screen plate and a template are subjected to an interconversion principle of a point load and an area load, the inner-side concrete and the protective layer are constructed respectively and independently, therefore, the process is simple, the quality is guaranteed, the construction speed is accelerated, a heat insulation layer and a main structure are completed at the same time, the construction period time of outer walls is shortened, the fireproof effect is remarkable, the problems, such as cracking and falling of the outer heat insulation layer of the outer walls, and the service life is prolonged.

The invention discloses a non-stick pan coating with graphene material. The non-stick pan coating is composed of a bottom layer and a surface layer; the bottom layer is composed of the following parts by weight of raw materials: 50-90 parts of polytetrafluoroethylene Ethylene / polysulfone blend, 0.5-2 parts modified graphene oxide, 1-5 parts thermochromic pigments, 0.8-1.2 parts modified silicon carbide whiskers, 1.5-3 parts additives and 15-35 parts deionized water; the surface layer is composed of the following raw materials in parts by weight: 35-75 parts of polytetrafluoroethylene resin, 1.5-5 parts of modified calcium carbonate whiskers, 3-8 parts of fatty alcohol polyoxyethylene ether ammonium sulfate, 5 parts of ~10 parts maleic anhydride and 35-60 parts deionized water. Through the reasonable compatibility of different raw material components of the bottom layer and the surface layer, the prepared non-stick pan coating has a better over-temperature prompting function, is more conducive to the control of the cooking temperature, and has excellent high temperature resistance and wear resistance. Extends the life of non-stick pans.

The invention discloses a fiber-doped reinforced microporous concrete six-surface-coated heat-insulating core material box-type structure product and a production method thereof. Fiber-doped reinforced microporous concrete and an efficient heat-insulating core material in a gapless manner are compounded to form a six-surface-coated frame-box-type small fireproof sub-bin structure, an inorganic material and six-surface coating with an organic efficient thermal insulation material achieve isolation from contacting with air and open fire, so good fireproof performance is achieved; and the box type structure limits thermal expansion of the core material, cracking and falling caused by uneven deformation are prevented, the durability of the product is greatly improved, and the product has the excellent characteristics of high strength, light weight and the like. After a wall is formed, the technical requirements of building heat preservation and structure integration and the same fireproof grade, durability and service life of a heat preservation layer and a main body structure can be really met. Unification of efficient heat preservation and fireproof durability is achieved.

The invention discloses a novel silicate external wall insulation material. The novel silicate external wall insulation material comprises a boundary layer, an insulation board and a facing layer. The boundary layer is used for bonding a wall surface base body with the insulation material. The insulation board is a silicate insulation board. The facing layer is sprayed onto an outermost layer of the insulation board. The novel silicate external wall insulation material provided by the invention has the following beneficial effects that polypropylene fibers are added into the boundary layer, so that the toughness and the tension resistance of the insulation material are improved, and not only is the good bondability between the insulation material and the wall surface base body ensured, but also cracking and disengaging of the insulation material can be prevented; the silicate insulation board has fire resistance and is low in heat conductivity coefficient, so that a good insulation effect can be achieved; and the insulation board is isolated from making contact with air through the facing layer, and the service life of the insulation material is prolonged.

The invention claims an outer wall heat insulation face brick with a glaze-imitating surface and a preparation method thereof. The outer wall heat insulation face brick consists of a heat insulation layer basal body and a glaze-imitating surface layer integrated with the heat insulation basal body into a whole, wherein the glaze-imitating surface layer is prepared from phthalic anhydride-propanediol resin, silicon oxide particle, Portland cement, silica solution, inorganic short fibre, stearic acid, ammonium persulfate, benzoin, nanoscale titanium oxide superfine micro powder and nanoscale silicon oxide superfine micro powder. The preparation method ensures that the heat insulation layer and a decorative layer are firmly bonded, has high intensity and can effectively prevent the decorative layer from cracking and falling off; and besides, the decorative layer has the advantages of light weight, ageing resistance, long service life, water and moisture protection, good appearance effect, energy saving, environment protection, resource saving, and the like.