93results about How to "Increased fracture energy" patented technology

An outside wall multi-functional protective slurry is composed of A and B components, in which A component contains elastical latex, cellulose aether, crack resistance fiber, lignified fiber, dispersant, anti mildew agent; B A component contains cement, perlite, girasol pearl, pulverized fuel ash, water reducer. The inventive outside wall multi-functional protective slurry has a perfect crack resistance and a high cohesive strength. The slurry matches with the outside wall external heat retaining and has a high cost performance. The invention accords to the industry standards of construction industry of JG/T157-2004 <> and outside wall heat retaining plaster standard and it has a certain heat insulation and heat retaining function.

The invention provides a preparation method of lightly-crosslinked aliphatic-aromatic copolyester. The copolyester can be synthesized and prepared from the following components: a) aromatic dibasic acid, ester, anhydride or a mixture thereof; b) aliphatic dibasic acid, ester, anhydride or a mixture thereof; c) aliphatic dibasic alcohol or alicyclic dibasic alcohol; and d) a compound with three or more esterification functional groups. The preparation method comprises the following steps: adding the four components a, b, c and d into a reaction device according to a certain ratio; vacuumizing; filling nitrogen gas; reacting at 170-230 DEG C; vacuumizing to carry out polycondensation reaction after the completion of esterification and/or interesterification; taking out the product after the completion of reaction; and cooling and molding in water to obtain the copolyester. The invention overcomes the defect of high complexity in the copolyester preparation process in the prior art. Besides, by adding the component d, the invention further improves the performance of the copolyester and widens the application range of the copolyester.

The invention relates to a low dielectric constant polyhedral oligomeric silsesquioxane (POSS)/ epoxy resin hybrid material and a preparation method. Epoxy resin and eight epoxy group polyhedral oligomeric silsesquioxane (G-POSS) are evenly mixed in a 80 DEG C breaker according to a certain proportion, an equivalent amount of curing agent triethylene tetramine (TETA) (an amino group in the TETA and an epoxy group in the G-POSS, epoxy resin (EP) are measured according to a 1:1 molar rate) is added and fully stirred, after vacuum defoamation is conducted for 20-30 minutes, the mixture is slowly poured into a preheating mold, conducted solidification in a stove 50 DEG C/ 2 hours, 70 DEG C/ 3 hours and 80DEG C/ 1 hour, cooled to room temperature along with the stove and processed for 4-6 hours after demolding. The low dielectric constant POSS/ epoxy resin hybrid material is small in average grain size and excellent in transparent performance, mechanical property and dielectric property.

The invention provides silicon carbide ceramic and a preparation method thereof. The preparation method includes: subjecting a ceramic main raw material, a binder accounting for 2.5-3% of weight of the ceramic main raw material and a dispersant accounting for 1.5-2.5% of the weight of the ceramic main raw material to cold isostatic pressing and liquid phase sintering. Generally, dry pressing is adopted for forming a ceramic material; during dry pressing, various performances of a material are influenced by nonuniform density distribution inside a blank caused by nonuniform pressure distribution; compared with dry pressing, cold isostatic pressing is uniform in pressurizing, pressures received by the material in all directions are identical, and sintering density, bending strength and rupture strength of the material are improved.

The present invention discloses a method for preparing a polyimide film having a low dielectric constant and high fracture toughness. The method comprises: first preparing an aromatic diamine solution, and then grinding and well mixing a carbic anhydride-maleimido heptaisobutyl polysilsesquioxane alternating copolymer and aromatic dianhydride; adding the mixture to the aromatic diamine solution, and then stirring to obtain a carbic anhydride-maleimido heptaisobutyl polysilsesquioxane alternating copolymer/polyamide acid solution; uniformly applying the carbic anhydride-maleimido heptaisobutyl polysilsesquioxane alternating copolymer/polyamide acid solution to a clean glass sheet, and then placing the glass sheet in a vacuum drying cabinet for treatment; cooling the treated glass sheet to room temperature and then putting same in water for ultrasonic peeling of a film, and vacuum drying the film to obtain a target product. The dielectric constant of the film obtained in the present invention is reduced to 2.2, the breaking elongation is increased by 272%, and the tensile energy is increased by 285%, so that the breaking elongation and tensile energy are greatly increased, and thus the fracture toughness is good.

The invention provides a multi-scale fiber reinforced cement stable gravel roadbase material doped with different-length fiber, such as micro-steel fiber and the like. The invention provides a methodwhich can better improve the performance of cement stable gravel roadbase material than flexible fiber and effectively improve the shrinkage crack resistance capability and mechanical property of theroadbase material. The multi-scale fiber reinforced cement stable gravel roadbase material of the invention comprises cement stable gravel and multi-scale fiber material, wherein, the multi-scale fiber material comprises micro-steel fiber and glass fiber, and the doping amount of the micro-steel fiber and the glass fiber is respectively 0.8-1.2kg/m<3>. The invention adopts multi-scale short fiber,has favorable mixture workability and even fiber dispersion and is easy to satisfy construction requirements; low fiber doping amount effectively lowers material cost; in the process of base materialcrack expansion, addition of short cut glass fiber causes to form a plurality of micro cracks, which further effectively improves impact resistance of the base material and increases crack energy.

Relating to the field of biomass composite materials, the invention provides a biomass polymer hybrid laminated composite material and a preparation method. The biomass polymer hybrid laminated composite material and the method solve the problems that great energy consumption and high production cost exist in current artificial board production processes, the product causes serious environmental pollution, and the comprehensive performance of the material is poor. According to the different material characterization characteristics of an organic polymeric material, an inorganic polymeric material or high polymer material, arbitrary interlaminar combination is carried out, thus obtaining laminated composite materials with different characterization characteristics. The method makes full use of the molding mechanism of an inorganic polymeric material and a water-based organic polymeric material under room temperature and atmospheric pressure conditions on a biomass composite multifunctional lamination compound machine, and gives full play to the interface mixing and dissolving combination advantages of polymer materials. The material provided in the invention is free of formaldehyde and phenol, can burn for 8h under 5000KJ with no naked flame, and only a slight carbonization phenomenon exists. After immersion in clear water for 30 days, the expansion rate does not exceed 8%.

The invention provides a polycrystalline cubic boron nitride composite sheet and a preparation method and application thereof, and belongs to the technical field of superhard materials. The PCBN is prepared from the following raw materials in parts by mass through high-temperature and high-pressure sintering: 70-90 parts of CBN, 3-8 parts of nano aluminum oxide, 6-18 parts of a tungsten-titanium solid solution and 1-4 parts of a sintering aid, the sintering aid is aluminum nitride or rare earth oxide, wherein the mass ratio of the tungsten element to the titanium element in the tungsten-titanium solid solution is 1: 1. The polycrystalline cubic boron nitride composite sheet has the characteristics of high strength and high hardness.

The invention relates to concrete with high toughness, which is used in the technical field of constructional engineering. The concrete comprises the following components in portion by weight: 30 to 50 portions of cement, 30 to 50 portions of quartz sand, 2 to 25 portions of steel fiber, and 10 to 20 portions of water. The concrete has the advantages that the concrete has ultrahigh strength and high elastic modulus, improves breaking energy, has high toughness and high durability, prolongs the service life of a structure, does not need reinforcing bars, lowers construction cost of engineering, and can be used for pouring large-span concrete bridges and high-rise building struts and replace steel to pour large-sized pressure pipelines and the like.

The invention discloses a macromolecule polymer emulsion. The macromolecule polymer emulsion comprises the following components in parts by mass: 0.1-2 parts of neoprene latex, 3-4.3 parts of butyl latex and 45-49 parts of ethyl acrylate latex. A preparation method of the macromolecule polymer emulsion comprises the following steps: (1) preparing materials; (2) preparing a first emulsion; (3) preparing a waterproof agent; (4) preparing a second emulsion; (5) preparing an additive solution; and (6) preparing the finished product. A waterproof coating comprises the following components in parts by mass: 36-45 parts of the macromolecule polymer emulsion, 50-58 parts of composite powder and 5-6 parts of additives. The macromolecule polymer emulsion is high in elongation rate; the waterproof coating has waterproof and self-healing functions.

The invention discloses a preparing method for ablation-resistant high-ortho phenolic fibers. A phenolic compound and formaldehyde are mixed according to a certain proportion, then a certain amount of citric acid as a catalyst is added, and a boiling reaction is carried out for 0.5-4 h; diluted concentrated sulfuric acid is added, and the reaction continues for 30-50 min; decompression and dehydration are carried out for 0.5-2.9 h, boric acid accounting for 1-8% by mass is added for a modification reaction after the temperature reaches 90-97 DEG C, and boiling is carried out for 2 h at the constant temperature; decompression and dehydration are carried out, and dehydration is stopped when the temperature of resin reaches 110 DEG C; the resin is subjected to melt spinning at 120-160 DEG C; nascent fibers are put into a prepared curing solution, the temperature is increased to 95 DEG C gradually from the room temperature, and the nascent fibers are naturally cooled to the room temperature after constant temperature is achieved; the temperature is gradually increased for thermosetting under the nitrogen condition. The fiber strength of the high-ortho phenolic fibers ranges from 3 cN/dtex to 36 cN/dtex, the modulus ranges from 40 cN/dtex to 400 cN/dtex, and the cross-linking degree ranges from 32% to 38%.

The invention is used for mainly overcoming the deficiencies of low compressive strength and poor flexural strength of concrete, and provides a reinforced concrete preparation method with simple preparation process. Reinforced concrete has the advantages of light weight, high strength and high toughness and is expected to be directly applied to batch industrial production in future. The invention aims to provide the reinforced concrete including the following components in parts by weight: 11.98-12.80 parts of cement, 1.50-1.82 parts of fly ash, 1.1076-1.1143 parts of a mineral powder, 4.79-4.97 parts of water, 22.29-22.45 parts of sand, 30.9-31.9 parts of stone, and 0.368-1.389 parts of a carbon fiber composite material. The carbon fiber composite material includes epoxy resin and a carbon fiber, wherein the weight of the epoxy resin accounts for 30%-33% of the weight of the carbon fiber composite material.

The invention relates to a biomass layered composite board with excellent physical properties. The technical scheme is that the composite board has an organic layer and a composite layer; the organic layer and the inorganic layer are alternately distributed; and the total layer number of the broad is an odd number. The invention is widely applicable to buildings, furniture, indoor and outdoor decorations, and interior trims of vehicles, vessels and airplanes.

A method for producing a structure by direct bonding of two elements, the method including: production of the elements to be assembled and assembly of the elements. The production of the elements to be assembled includes: deposition on a substrate of a TiN layer by physical vapor deposition, and deposition of a copper layer on the TiN layer. The assembly of the elements includes: polishing the surfaces of the copper layers intended to come into contact so that they have a roughness of less than 1 nm RMS and hydrophilic properties, bringing the surfaces into contact, and storing the structure at atmospheric pressure and at ambient temperature.

An aqueous polyurethane resin dispersion which can provide a coating film having high impact resistance and hardness and excellent in adhesiveness to an electrodeposited coating surface is to be provided.

It is an aqueous polyurethane resin dispersion which comprises a polyurethane resin obtained by reacting (A) a polyurethane prepolymer which is obtained by reacting (a) a polyisocyanate compound, (b) at least one polyol compound containing a polycarbonate polyol having a number average molecular weight of 400 to 3000, (c) an acidic group-containing polyol compound, and (d) a blocking agent for an isocyanate group, which dissociates at 80 to 180° C., and (B) a chain elongating agent which has reactivity with the isocyanate group, being dispersed in an aqueous medium, a sum of a content of urethane bodings and a content of urea bondings is 15 to 30% by weight in terms of solid components, a content of carbonate bondings is 8% by weight or more and less than 15% by weight in terms of solid components, and a content of an isocyanate group to which the above-mentioned blocking agent has bound is 0.2 to 3% by weight in terms of solid components and calculated on the isocyanate group.

The invention discloses tungsten mesh toughened hafnium carbonitride-based metal ceramic and a preparation method thereof. The tungsten mesh toughened hafnium carbonitride-based metal ceramic is composed of a hafnium carbonitride matrix and tungsten meshes distributed in the hafnium carbonitride matrix at intervals. The preparation method comprises the following steps: mixing HfC powder, HfN powder, carbon powder and carbon nitride powder, ball-milling the mixture, and drying and sieving the ball-milling product to obtain mixed powder, wherein in the mixed powder, the mass ratio of the HfC powder to the HfN powder is (1-7): 1; alternately stacking and laying the mixed powder and the tungsten meshes in a mold to obtain a to-be-sintered body; and performing spark plasma sintering on the to-be-sintered body to obtain the tungsten mesh toughened hafnium carbonitride-based metal ceramic. The tungsten mesh toughened hafnium carbonitride-based metal ceramic provided by the invention has excellent thermal shock resistance and ablation resistance.

The invention discloses a preparation method of ductile retarding fine aggregate concrete with initial setting time of 48-72 hours, belongs to the technical field of building construction, and particularly relates to a preparation technology of the ductile retarding fine aggregate concrete. Cement, fly ash, slag powder and a reinforcing compacting agent are adopted to form a cementing material, and the fly ash, the slag powder and the reinforcing compacting agent not only improve the performance of a concrete mixture, but also can improve the early-stage or later-stage strength of concrete, improve the pore structure and improve the compaction performance of the concrete; meanwhile, the effects of saving resources and protecting the environment are achieved. The concrete is suitable for pier wall reinforced concrete structures in the fields of construction engineering, water conservancy engineering, traffic engineering, water transportation engineering and the like, a layer of ductileretarding concrete is poured at the root of the pier wall, and the concrete can also be suitable for underground secant piles and structural construction joints needing to be poured by several times.

A joined part of an aluminum-coated steel sheet and an aluminum sheet is composed of an intermetallic compound layer which exists in a region in which a part of a coated layer exists before the joining and an aluminum melted and solidified part which also exists on the side of the aluminum sheet to enclose the intermetallic compound layer. The atoms existing on the surface of the aluminum melted and solidified part are intermetallic-bonded with atoms which exist on the surface of the steel sheet except in the region in which the intermetallic compound layer exists seen in the plan view. Further, the area of the intermetallic compound layer is limited to 60% or less of the total area of the joined part at the interface between the aluminum-coated steel sheet and the aluminum sheet. Thus, the area of the aluminum melted and solidified part exceeds 40% of the total area of the joined part. The strong joining having a high fracture energy can be provided at a high efficiency.