14results about How to "Improve structural compactness" patented technology

The invention relates to a design method for the mix proportion of carbonized 3D printing concrete and the carbonized 3D printing concrete. Carbon dioxide is introduced into cement-based printing slurry, the introduction amount of the carbon dioxide is controlled, and when the carbon dioxide is introduced into the cement-based printing slurry, the use amount of magnesium chloride is calculated according to the content of a carbonization reaction product CaCO3 and the proportion of calcite to aragonite in a required concrete mixture. Magnesium chloride and carbon dioxide are added into the cement-based printing slurry at the same time for full reaction, and finally the 3D printing concrete material is prepared. By adding magnesium chloride and generating aragonite type calcium carbonate, the thixotropic behavior of the material is improved, the constructability of the cement slurry is higher, the orientation of the nano-scale aragonite fibers is arranged according to the printing direction, the reinforcing and toughening effects are excellent, and the bending resistance, bending resistance and compressive strength are all improved.

The invention discloses a flame-retardant polyester yarn and a preparation method thereof, and relates to the technical field of textile, the flame-retardant polyester yarn is prepared by blending flame-retardant functional fibers and basalt fibers according to the mass ratio of (8-10): 1; the flame-retardant functional fibers are prepared from the following raw materials: polyester chips, flame-retardant polyamide polycondensates, flame-retardant addition polymers, antioxidants and lubricants; the flame-retardant polyamide polycondensate comprises a structural unit introduced by the following monomers: 4, 4-diaminodiphenyl sulfide, 2, 3-quinoline dicarboxylic acid, and 3, 3 '-diamino-4, 4'-difluorodiphenyl sulfone; the polymerization inhibition addition polymer comprises structural units introduced by the following monomers: acrylamide, 4-acryloyl benzophenone hydroxybenzoate, diphenyl (4-vinyl phenyl) phosphine oxide, and 3-(1, 1-difluoro-2-propylene-1-yl)-2 (1H)-quinoxalinone. The yarn is good in mechanical property and damp-heat aging resistance and excellent in flame retardant property.

The invention discloses an inorganic fiber composite board adhesive with high durability and environmental protection performance and a method, according to the adhesive, rock wool fiber powder and surface modified nanoparticles are combined to form an inorganic filler, a synergistic effect is achieved on a microstructure, and the hardness and wear resistance of the adhesive and the stability of a composite board are effectively improved. By adding the quaternary ammonium salt catalyst, the curing temperature is remarkably reduced, the production efficiency is improved, and complex environments are adapted. And the phosphorus-nitrogen composite flame retardant is adopted, so that the fireproof performance of the composite board is enhanced, a compact carbonized layer is formed in case of fire, and flame diffusion is prevented. And the internal structure of the plate is uniform and stable through the section-by-section heating and pressurizing process, and high-precision application is achieved.

The application discloses a method for improving the surface quality and performance of a laser cladding NiCrSiBC-WC composite coating, relates to the field of composite coating surface processing technology, and aims at solving the problem that the coating prepared through single laser cladding is prone to cracks. The method comprises the following steps: S1, pretreatment of a base material; S2, preparation of laser cladding powder; S3, laser cladding treatment; S4, temperature field auxiliary treatment; and S5, laser remelting composite temperature field auxiliary treatment. The laser remelting composite temperature field auxiliary technology can break the limitation of the WC material addition amount on the performance of the coating, and a low-WC-mass-fraction high-hardness crack-free NiCrSiBC-WC composite coating can be obtained through the technology. The structure compactness of the NiCrSiBC-WC coating is improved, and the surface hardness and bonding force of the coating are improved.

The application relates to the technical field of solid waste treatment and building materials, and discloses a modified sludge solidifying agent and a preparation method thereof, the solidifying agent contains modified aggregates 15-28 parts, a composite cementing agent 55-70 parts, an efficient water absorption modifier 6-12 parts, an organic polymer modifier 2-5 parts and early strength additives 1-3 parts in terms of weight fractions, and the components are mixed through proportioning and a segmented preparation process. The modified aggregates construct a framework support, the composite cementing agent provides hydration cementing action, the efficient water absorption modifier realizes rapid dehydration and heavy metal adsorption, the organic polymer modifier optimizes interface combination, and the early strength additives improve early strength. The application takes industrial solid waste as a main raw material, has high solid waste utilization rate, is low-carbon and environment-friendly, can quickly reduce the water content of sludge, significantly improves the mechanical properties and durability of a solidified body, effectively stabilizes heavy metals, and has a wide application prospect.

The invention discloses UHPC160 with ultrahigh bonding strength as well as a preparation method and application thereof, and belongs to the field of concrete. The preparation method of the UHPC160 comprises the following steps: A, a bonding enhanced composite admixture compounding technology; b, designing a skeleton stacking densification mix proportion; c, a composite fiber system bonding enhancement technology; and D, a rapid construction technology without a special interface processing method. According to the present invention, the adhesion-enhanced composite admixture with characteristics of strong depolymerization, efficient water reducing and shrinkage inhibition is developed, the mix proportion optimization design based on the dense stacking theory principle is adopted, and the composite fiber system composed of the organic metal fiber and the inorganic anti-cracking fiber is doped; the ultra-high performance concrete UHPC160 with ultrahigh bonding strength, ultrahigh flow state, low cement consumption, low fiber consumption and excellent durability can be prepared, the 28d limit bonding strength of the ultra-high performance concrete UHPC160 can reach 15.8 MPa, the 28d compressive strength of the ultra-high performance concrete UHPC160 can reach 168.5 MPa, the expansion degree of the ultra-high performance concrete UHPC160 can reach 810 mm, the construction difficulty of a maintenance and reinforcement project is remarkably reduced, and the construction quality of the maintenance and reinforcement project is improved.

This invention discloses a composite coating for concrete structures, comprising a sealing primer, an intermediate coat, and a topcoat. The sealing primer is a polyurea coating with modified concrete added, the amount of modified concrete being 3%–6% of the coating weight, and the thickness of the sealing primer being 20–100 μm. The intermediate coat is a polyurethane coating with steel powder added, the amount of steel powder being 3%–6% of the coating weight, and the thickness of the intermediate coat being 80–200 μm. The topcoat is an epoxy resin coating with molybdenum disulfide powder added, the amount of molybdenum disulfide powder being 1%–4% of the coating weight, and the thickness of the topcoat being 50–100 μm. The sealing primer of this composite coating fills concrete pores and cracks, improving structural density and providing a good foundation for subsequent coatings. The intermediate coat enhances overall strength and impact resistance, while the topcoat provides excellent anti-friction properties and chemical stability, blocking external erosion. The synergistic effect of these three components significantly extends the service life of concrete structures in harsh environments.

The invention relates to an airtight ceramic-based composite material and a preparation method thereof. The method comprises the following steps: preparing an interface layer on the fiber surface of a carbon fiber preform through a CVD method; preparing a modified resin solution from carbide ceramic powder, furfuryl ketone resin and an organic solvent, and then reacting the modified resin solution with the obtained carbon fiber preform with the interface layer through a PIP process to obtain a modified C / C composite material; carrying out infiltration reaction on the modified C / C composite material and silicon powder to obtain an infiltration reaction composite material; and enabling the ceramic precursor solution to react with the infiltration reaction composite material through a PIP process to prepare the airtight ceramic-based composite material. The ceramic-based composite material with better gas tightness is prepared, the method is simple in technological process, short in period and low in cost, and the prepared material has wide application prospects and particularly has important pioneer positive significance in coping with extremely harsh use environments involved in the aerospace field.

The invention relates to the technical field of materials, and discloses biodegradable resin for spinning fiber production and a preparation method thereof.The biodegradable resin is prepared by taking polypropylene carbonate dihydric alcohol as a soft segment and polyisocyanate as a hard segment, adding a polyhydric alcohol cross-linking agent and an inorganic modified cross-linking agent and carrying out a melt extrusion process; the structure of the polyhydric alcohol cross-linking agent contains perfluoro chain segments and tert-butyl chain segments which are of an alternating structure, a stable super-hydrophobic membrane can be formed on the surface of the resin, permeation of acid and alkali is prevented, the inorganic modified cross-linking agent can participate in the polymerization process of the resin, a continuous physical barrier layer is formed in the resin, a corrosion medium is further prevented from permeating into the resin, and the corrosion resistance of the resin is improved. And the addition of the cross-linking agent enables the molecular chain of the resin to be more compact and the structure to be more compact, so that the resin shows excellent corrosion resistance.

The present invention relates to a reactive phosphate functional emulsifier and a preparation method thereof, and belongs to the technical field of emulsifiers. A reactive phosphate functional emulsifier is prepared by using vinyl salicylaldehyde, phenyl phosphoryl dichloride, 2-amino-4-fluorothiophenol and glycidyl methacrylate as raw materials. The present invention is modified by grafting vinyl salicylaldehyde with phenyl phosphoryl dichloride, and then connected with 2-amino-4-fluorothiophenol to form an imine bond, and a polymer is generated with glycidyl methacrylate. The emulsifier can enhance the material structure density and thermal stability of the coating system. At the same time, the cross-linking carbonization ability of the imine structure, the synergistic flame retardancy of fluorine, nitrogen, phosphorus and sulfur elements, promote the dehydration of the coating into carbon, and enhance its flame retardant effect.

The invention relates to a porcelain tile with natural travertine texture and a preparation method thereof, a large amount of semi-permeable material is added into travertine powder, and the semi-permeable material contains a large amount of silicon dioxide and aluminum oxide, so that more mullite crystal structures and skeleton structures can be generated at holes, the holes have better mechanical strength, and the porcelain tile with natural travertine texture is prepared. Ceramic tile products are effectively prevented from being broken; the porcelain tile provided by the invention has very good mechanical properties, is very suitable for manufacturing large-specification travertine tile products, and can restore the unique decorative effect of natural travertine to the greatest extent.

This invention relates to a supersulfate cement concrete based on construction waste aggregate and minerals, and its preparation method. The concrete, by mass, comprises 380-460 parts supersulfate cement; 950-1250 parts modified mixed aggregate; 0-150 parts natural sand; 135-165 parts water; and a water-reducing agent at 0.7-1.2% of the total mass of the cementitious materials. The modified mixed aggregate is obtained by mixing construction waste and calcium vanadium stone enrichment at a mass ratio of (85-92):(8-15), followed by sequential modification with alkali solution, silane coupling agent, and slag. The present invention achieves a construction waste aggregate replacement rate of 70-100%, requires no complex modification equipment or processes, is easy to scale up for industrial production, and is highly practical.

The present application relates to a kind of carbonization 3D printing concrete mix design method and carbonization 3D printing concrete.The present application is introduced into carbon dioxide to cement-based printing slurry, controls its amount of introduction, while introducing carbon dioxide into cement-based printing slurry, according to the content of carbonation reaction product CaCO3, and the ratio of calcite and aragonite in the required concrete mixture, the amount of magnesium chloride is calculated, magnesium chloride and carbon dioxide are added into cement-based printing slurry at the same time, fully react, finally 3D printing concrete material is prepared.The present application improves the thixotropy of material by the addition of magnesium chloride, the generation of aragonite type calcium carbonate, the constructability of cement slurry is stronger, at the same time, the orientation of nanoscale aragonite fiber is arranged according to the printing direction, has excellent reinforcing and toughening effect, and the bending strength, bending strength and compressive strength are improved.

The invention discloses a preparation method of a sandwich type piezoelectric transducer immersed in an ultrahigh-pressure liquid in order to endow the sandwich type piezoelectric transducer with the capability of working in the ultrahigh-pressure liquid. The front end cover, the piezoelectric ceramic piece set, the rear end cover and the pre-tightening bolt form a sandwich type piezoelectric transducer, and the pre-tightening bolt is screwed in to enable the front end cover and the rear end cover to clamp the piezoelectric ceramic piece set. The bonding glue is used for bonding the interface of the front end cover, the piezoelectric ceramic piece group and the rear end cover, the pouring glue is used for filling a cavity in the sandwich type piezoelectric transducer, and the glue is coated to realize electrical insulation between the sandwich type piezoelectric transducer and external liquid. Bubbles remaining in the adhesive glue and the potting glue are discharged in a vacuumizing mode, and the texture is soft after the coated glue is vulcanized. By means of the method, the structural compactness of the sandwich type piezoelectric transducer is improved, it is guaranteed that the sandwich type piezoelectric transducer cannot be subjected to structural damage in ultrahigh-pressure liquid, and a technical basis is provided for developing piezoelectric sensors and actuators oriented to the ultrahigh-pressure liquid.