47results about How to "Overcome cracking defects" patented technology

This invention relates to a method to produce phenolic foam heat preserving materials by ordinary-temperature foaming, is which phenol formaldehyde is adopted as raw materials and anhydrous polyethylene oxide sorbitan mono-oleate, aluminium hydroxide, pentane and composite acid curing agent are added. It has the characteristics that auxiliary agents and reinforcing modifiers can be also added in the raw materials; the ingredients added into the phenol formaldehyde raw materials have proportions as follows: 4~8 shares of polyethylene oxide sorbitan mono-oleate, 0.1~20 shares of auxiliary agents, 0.5~25 shares of reinforcing modifiers, 0~80 shares of aluminium hydroxide, 6~20 shares of pentane and 8~20 shares of composite acid curing agent, counting in 100 mass shares of phenol formaldehyde. In this invention, ordinar-temperature preparation of phenolic foam heat preserving materials above 0 deg. C can be realized. The phenolic foam heat preserving materials prepared have excellent properties; they help save energy and can be applied in spot construction, and therefore, they are promising materials.

The invention discloses an improved structure of a corrugated paperboard production line and belongs to production devices of corrugated cases. The improved structure of the corrugated paperboard production line aims at preventing cracks from generating on the paperboard close to indentation lines. The improved structure of the corrugated paperboard production line comprises a conveyor and a marking press, a nozzle (2) is respectively fixed at the position higher than the conveyor (5) in front of two indentation wheels (3) of the marking press, and the nozzles (2) are respectively communicated with a spraying device (6) through pipelines; a photoelectric sensor (1) electrically connected a controller (7) is arranged in front of the nozzles (2), and the controller (7) is electrically connected with the spraying device (6). The improved structure of the corrugated paperboard production line thoroughly overcomes the shortcomings that paper boards are crisp and can be cracked nearby the indentation lines, and solves the problem that indexes of compressive strength, puncturing strength and the like can drop easily caused by large paperboard moisture.

The invention provides a method for preparing heat-insulation materials from nano-silica filled non-graphitized carbon foam, and relates to a method for applying non-graphitized carbon foam to the preparation of heat-insulation materials. The method solves the problem that the prior aerogel is poor in mechanical properties and cannot be used as independent blocks. The method comprises: allowing mixture of tetraethyl orthosilicate, deionized water and absolute ethanolto react to 10 to 15 minutes under acidic and alkaline conditions respectively; soaking obtained alcogel in tetraethyl ortho-silicate ethanol solution; washing the obtained product with deionized water to obtain SiO2 sol-gel; immersing non-graphitized carbon foam in the SiO2 sol-gel; drying the obtained product; and obtaining nano-silica filled non-graphitized carbon foam heat-insulation composite material. The heat-insulation material obtained by the method can be used as independent blocks, is strong in mechanical properties compared with aerogel, and has the heat-insulation temperature between 1,200 and 1,300 DEG C.

The invention discloses an ABS (acrylonitrile butadiene styrene)/PA (polyamide) composite antibacterial pipe and a preparation method thereof. The composite antibacterial pipe comprises the following components in parts by weight: 60-80 parts of ABS, 25-40 parts of PA, 5-20 parts of polyester thermoplastic elastomer, 1-6 parts of nano-silver powder, 0.5-5 parts of ammonium dihydrogen phosphate, 2-5 parts of 2, 6-tributyl-4-methylphenol, 1-4 parts of diester thiodipropionate, 6-15 parts of chlorinated polyethylene, 0.5-1.2 parts of stearic acid and 5-10 parts of titanium dioxide. The prepared composite antibacterial pipe has not only good tolerance, but also good antibacterial effect.

The invention discloses a preparation method of nano-silica compacted concrete. The preparation method comprises the following steps: preparing nano-silica of which the surface is coated with nano-alumina into a nano-silica aqueous solution with the concentration of 0.05 to 0.5 mol/L and injecting the nano-silica aqueous solution into an electrolytic cell; putting a concrete specimen with built-insteel bars into the electrolytic cell, connecting the steel bars into a power supply cathode, arranging an auxiliary anode parallel to the concrete specimen outside the concrete specimen and connecting the auxiliary anode into a power supply anode; under the condition of 0 to 4 DEG C, applying 6 to 96 V/cm impressed voltage between the power supply cathode and the power supply anode in the S3 andthen electrifying. According to the method disclosed by the invention, by taking the nano-silica as a raw material and applying an external electric field, the nano-silica enters pores of the concrete through electrophoresis drive; by utilizing C-S-H gel generated through reacting the nano-silica solution with calcium hydroxide, the pores in the concrete are filled to obtain compacted concrete, and further the durability of the concrete is improved.

The invention discloses a high-strength sausage casing. The high-strength sausage casing comprises the following components of 0.2-0.4 part of transglutaminase, 16-20 parts of collagen, 2-4 parts of wood ear polysaccharide, 5-6 parts of glycerine and 13-18 parts of water. The invention further discloses a preparation method of the high-strength sausage casing. The high-strength sausage casing hasthe beneficial effects that oligosaccharide chains of bioactive peptides and wood ear polysaccharide form glycoprotein through covalent bonds. The glycoprotein can improve the activity of the transglutaminase, and further promote gamma-carboxylic acid amide groups and other amino acid residues in amino acid residues of collagen casings to be subjected to a crosslinked action, and through the covalent bond, firm network structures are formed. The mechanical strength and the tensile strength of the collagen casing are notably improved, and the defect that the casing is easy to crack in the cooking process is overcome.

The invention provides an earthen sanitary ware blank and a preparation method thereof. A proper quantity of raw materials such as kaolin and quartz are introduced; the crystalline phase content of mullite, quartz and the like in the blank is controlled; the glass phase content of potassium oxide and sodium oxide is reduced; the high-temperature plastic deformation is reduced; the low deformationof earthen sanitary ceramics is realized. The thermal expansion coefficient of the blank at 200 to 300 DEG C is regulated, so that the thermal expansion coefficient of the blank is matched with the thermal expansion coefficient of glaze. The problem that the earthen sanitary ware blank cannot overcome shrinkage and great deformation is solved, so that the earthen sanitary ware does not use engobeand does not generate glaze checking; qualified products are produced according to an earthen sanitary ware production method.

The invention provides a construction process for changing a cement concrete pavement into an asphalt pavement. The construction process comprises the following steps step 1, milling an original cement concrete pavement and cleaning waste residues; step 2, spreading SBR modified emulsified asphalt on the milled cement concrete surface for multiple times, wherein a spreading amount of starting, stopping and joints is slightly greater than the normal spreading amount during spreading; step 3, mixing a TPS high-viscosity asphalt mixture and paving the mixture on the surface of the SBR modified emulsified asphalt, wherein a paving starting speed is slightly lower than a normal paving speed during paving; and step 4, rolling the paved TPS high-viscosity asphalt mixture, wherein the TPS high-viscosity asphalt mixture starts to be rolled in a high-temperature state and cannot be repeatedly rolled in a low-temperature state. Due to a fact that the TPS high-viscosity asphalt has an excellent viscosity characteristic and an adhesion capacity, the TPS high-viscosity asphalt surface layer is adopted as an additional paving layer of the cement concrete pavement, a defect that the asphalt pavement is prone to cracking is overcome, a pavement bearing capacity is improved, and pavement safety and durability are enhanced.

The invention provides a construction method for a crack-resistant cast-in-situ hollow floor. The crack-resistant cast-in-situ hollow floor comprises a top flange plate (2), beams (3), a bottom flange plate (4) and combined filling members (5) placed in a floor ribbed beam gridding. The construction method includes casting wavy bottom flange concrete after reserving and pre-burying of pipelines, and then casting the beams and top flange concrete to construct the hollow floor (1). The inner surfaces of the top flange plate (2) and the bottom flange plate (4) are in a wavy shape (6). The value of the wave crest is larger than 50mm. The combined filling members are formed by more than three gas filled tubes (7) in parallel combination, and adjacent bonding portions (8) of the gas filled tubes are in close contact. The length of each single tube is as same as the width (51) of the combined filling members (5) when the combined filling members (5) are in parallel combination. The sum of the diameters of multiple tubes is as same as the length (52) of the combined filling members (5), and the ratio of the length (52) to the width (51) is not less than 0.7. The gas filled tube combined filling members (5) act with a steel tube supporting and separating component (9); the gas filled tubes are fully utilized, and the defects of punching resistance and cracking in the prior art are overcome according to features of the tubes; cost of the floor can be saved, convenient and rapid construction is realized, and the structure of the floor is more reasonable.

The invention discloses a light impact-resistant protection plate. The light impact-resistant protection plate comprises a ceramic layer, a ceramic-aluminum gradient layer which is jointed with the ceramic layer and foam aluminum buffer layers , wherein the side, jointed with the ceramic layer, of the ceramic-aluminum gradient layer is a first side; the side, jointed with the foam aluminum buffer layers, of the ceramic-aluminum gradient layer is a second side; and from the first side to the second side, the content of ceramic in the ceramic-aluminum gradient layer is gradually decreased to 0% from 100%, and the content of metallic aluminum is gradually increased to 100% from 0%. The weight of the light impact-resistant protection plate is obviously lowered; gradient gradual transition is realized at joint positions of various materials in the impact-resistant protection plate due to the ceramic-aluminum gradient layer, so that defects of stress concentration and cracking which easily happen at a interface between the ceramic and the metallic aluminum under a high impact load in the prior art are overcome. The invention further discloses a manufacture method for the light impact-resistant protection plate.

The invention discloses a cold-resistant and crack-resistant low-smoke, halogen-free and fire-retardant polyolefin sheath material with thermoplasticity and a preparation method thereof, and belongs to the technical field of cables. The cold-resistant and crack-resistant low-smoke, halogen-free and fire-retardant polyolefin sheath material is prepared from the following components in parts by weight: 20-60 parts of linear low density polyethylene (LLDPE), 20-40 parts of ethylene vinyl-acetate copolymer (EVA), 10-20 parts of styrenic block copolymer (SEEPS), 10-20 parts of alpha-ethylmescaline (AEM), 50-100 parts of magnesium hydrate, 20-50 parts of aluminum hydroxide, 10-20 parts of clinoptilolite, 10-20 parts of borate whisker, 1-5 parts of antioxidant and 2-6 parts of lubricating agent. The method comprises the following steps: firstly, adding the borate whisker, the clinoptilolite and 1% of silane coupling agent to a high-speed mixer and mixing; adding the residual components to the high-speed mixer, and then extruding and pelletizing the mixture in a two-stage pelletizer. The cold-resistant and crack-resistant low-smoke, halogen-free and fire-retardant polyolefin sheath material meets the requirements of an embrittlement experiment at low temperature of minus 40 DEG C and a crack-resistant experiment at high temperature of 150 DEG C, and furthermore has excellent flame retardant property.

The utility model relates to a socket-type plastic pipe welding device for pressure conveying medium. The whole device is arranged in the order of extruder, hot melt material storage barrel, feeding pipe, mold frame and support. There are upper mold and lower mold in the mold base, and a sealing plate is provided on one side of the upper mold and lower mold. , the inner side of the sealing plate is fixed with a mold core, the mold core moving cylinder fixed on one side of the mold base is connected with the sealing plate, the upper mold moving cylinder fixed on the mold base is connected with the upper mold, and the lower mold fixed under the mold base moves The cylinder is connected with the lower mold; when the socket tube is connected with the socket head, the defects of uneven connection strength of the electric heating belt and easy deformation and cracking of the pipe are overcome. The hot-melt connection between the socket pipe and the generated socket plug is firm, and the socket-type plastic pipe formed is suitable for operation in various environments. The relative cost of the project is low, and at the same time, the labor intensity of the operators is reduced, and the project progress is improved.

The invention relates to the technical field of gypsum mortar preparation, and particularly, relates to a moisture-resistant sound-insulation gypsum-based self-leveling mortar comprising a main material, an auxiliary material resin and an additive, wherein the auxiliary material resin is mainly a polyolefin elastomer, and the addition amount of the auxiliary material resin is 4-6 wt% of the weight of the main material. By optimizing the components of the mortar, adding the auxiliary material resin and controlling the addition amount, the moisture resistance of the mortar is improved, the defects that hollowing and cracking are prone to occurring are overcome, the weight is relatively small, construction is facilitated, the daily ground paving area can reach 800-1000 m<2>, and the foot feeling comfort is poor.

The thin wall corrugated metal pipe as stuffing mold includes one stuffing mold pipe and end plugs and features that the cross section of the stuffing mold pipe is quadrange with rounded angles. When the stuffing mold pipe is used in hollow floor board, the in-situ cast concrete rib formed between stuffing mold pipes has the shape of arc transitional rectangle, which has less consumption of concrete, small dead weight, good antiseismic performance superior to in-situ concrete rib formed with circular corrugated pipe. The present invention has high strength, high deformation and vibration resistance, convenient construction and transportation, and other features. The present invention is suitable for use in in-situ cast hollow beam-less reinforced concrete floor board as well as roofing, base board, wall and hollow bridge.