185results about How to "Improve initial strength" patented technology

The invention discloses an aqueous acrylic emulsion, an aqueous adhesive for pearlized film composite materials and a preparation method thereof, and belongs to the field of preparation of adhesive. The acrylic emulsion is polymerized from 20-40 wt% of acrylic acid hard monomer and 55-70 wt% of acrylic acid soft monomer and 1-5 wt% of acrylic acid functional monomer under the action of water, an emulsifying agent, an initiator, a buffering agent and a pH regulator. The invention also provides an aqueous adhesive and a preparation method thereof. The molecule segment of the film forming matter (acrylate copolymer) in the aqueous acrylic emulsion has various chemical groups, such as -OH, -COOH, -NH and the like; and the chemical groups can form various chemical bonds and hydrogen bonding acting force, and thereby having favorable adhering force for various composite substrates (plastic films, aluminum plating films, metal foils and the like). The polymer obtained by polymerization has higher molecular weight, lower coating viscosity and favorable levelling property; and thus, the polymer has high shear strength and initial strength and can achieve the best bonding strength without curing for a long time.

The invention relates to a solvent-type cold-patch asphalt liquid and a preparation technology therefor. The solvent-type cold-patch asphalt liquid comprises the following substances, by weight, 100 parts of petroleum asphalt, 10-15 parts of diluents, 10-15 parts of heavy oil, 10-15 parts of solvent naphtha, 1-5 parts of tackifier, 1-5 parts of strengthening agent, 0.2-0.8 part of surfactant and 0.5-0.8 part of anti-stripping agent. The above materials form performed polymers respectively and then are mixed uniformly, thus the obtained cold-patch liquid has good dispersibility, the stability of the obtained cold-patch asphalt liquid is raised, the storage stability is excellent, the employed tackifier, strengthening agent and anti-stripping agent can raise adhesion and strengthening effects of asphalt, and the surfactant can improve fluidity of asphalt substantially. The solvent-type cold-patch asphalt liquid is blended with aggregates when used to prepare cold-patch asphalt mixture for repairing pavement pits, no heating is needed during the blending process, the prepared cold-patch asphalt mixture has good initial and molding intensities and water damage resistance, and the construction workability is good.

The invention discloses a carbon fiber-based precoated sand material for selective laser sintering and a preparation method thereof. The carbon fiber-based precoated sand material comprises chopped carbon fibers, crude sand, an organic binder, a curing agent, a lubricant, a coupling agent and a dispersant. The preparation method comprises the following steps of carrying out surface modification treatment on the chopped carbon fibers, heating the crude sand, adding resin, adding a part of calcium stearate and a prepared coupling agent aqueous solution, adding a chopped fiber-containing urotropine curing agent, adding the rest of the calcium stearate, carrying out cooling and carrying out screening and sand discharge to obtain the product. The carbon fiber-based precoated sand material has the advantages that 1, the carbon fibers have thermal conduction effects, limit integral shrinkage of a sintered part to a certain degree and reduce warp phenomenon in molding, and 2, through laser sintering, the precoated sand substantially improves resin precoated sand thermostability, promotes curing reaction of phenolic resin at locals in the sintered layer and between the sintered layers and obviously improves laser sintering forming part blank strength.

The present invention relates to a cement-free alkali activated binder in which alkaline inorganic materials are appropriately added to an industrial waste such as blast furnace slag, fly ash, meta kaolin and the like, a method for producing mortar using the same and a method for producing cement-free alkali activated reinforcement mortar. Specifically, the present invention relates to a cement-free alkali activated binder that is not only environmentally friendly as being capable of dramatically reducing the carbon dioxide emission, which has been remained as a problem for producing Portlandcement, but also has an excellent property, a method for producing mortar using the same and a method for producing cement-free alkali activated reinforcement mortar.

The invention relates to a production method of high-strength large-elongation aluminum-clad steel wire, comprising the following steps: 1) hot-drawing high-carbon steel wire rod to different wire diameters through cold drawing; 2) carry out lead bath quenching treatment on that steel wire, and carry out on-line pickling and rinsing to obtain a pretreated steel wire; 3) uniformly cover an outer lay of that pretreated steel wire with a layer of aluminum to form a cladding blank; 4) that coat blank is drawn into a super-high-strength aluminum clad steel wire semi-finished product through multiple passes of a bimetal synchronous deformation wire draw machine; 5) age that semi-finished product of the high-strength aluminum-clad steel wire through a high-temperature box. The method of the invention changes the traditional lead bath heat treatment temperature, The tensile strength of Al-clad steel wire is increased by multi-pass synchronous deformation and drawing with small compression ratio, and the elongation of Al-clad steel wire is increased by high temperature aging treatment. The ultimate tensile strength >= 1700 MPa, elongation >= 3. 0%, and other indexes are in accordance with the requirements of Al-clad steel GB/T17937-2009 standard, thereby meeting the requirements of high strength and high elongation and meeting the application requirements.

The invention belongs to the technical field of casting and discloses a quick manufacturing method for a die-free casting sand mold. The quick manufacturing method comprises the following steps of: paving a layer of phenolic resin coated sand on a worktable by adopting a relevant power paving system in die-free casting sand mold manufacturing equipment controlled by a computer; secondly, driving an injection system of the equipment to inject solvent according to a contour data information instruction of each layer of section of the sand mold, which is acquired by the computer; melting and bonding the injected part of phenolic resin coated sand to form; drying; after finishing the forming of one layer, descending the worktable by a story height; carrying out power pavement, solvent injection and drying of next layer until a casting sand mold solid is formed by stacking and curing layer by layer; removing residual sand; and drying and curing the residual sand to obtain the casting sand mold with high strength. The quick manufacturing method disclosed by the invention has the characteristics of no heating required for initial curing and lower deformation of a sand core; meanwhile, the consumption of resin is reduced, and thus the defect of high gas forming amount of the casting sand mold is avoided. The quick manufacturing method has the advantages of low cost of used solvent, environment friendliness, energy source saving and popularization and application value.

The invention relates to a refractory material and particularly relates to a gunning mix for a blast furnace tapping channel, which aims at solving the problems that a channel lining is easily cracked and dropped in the prior art. The gunning mix for the blast furnace tapping channel comprises the following components in parts by mass: 35-45 parts of mullite of which the granularity is 3-5mm, 25-35 parts of corundum of which the granularity is 1-3mm, 12-25 parts of silicon carbide of which the granularity is 0-1mm, 8-12 parts of alumina powder, 6-10 parts of cement, 0.1-0.3 part of explosion-proof fiber, 1-3 parts of graphite and 3-5 parts of iron silicon nitride. According to the gunning mix disclosed by the invention, by adding the explosion-proof agent, the adhesion rate can be increased and the cracking and dropping are prevented, and especially when the high-temperature gunning is carried out, since voids are formed by melting fibers, the porosity is increased to provide a passage for the rapid exhaust of the steam; the gunning mix contains relatively high content of Al2O3 and is suitable for a part with a serious melting loss need to be repaired on the main channel; cement is conductive to improving the initial strength of the gunning mix and thus the gunning mix can withstand relatively high vapor pressure and thus the burst is avoided and the gunning mix has relatively high adhesion force and durability; by adding iron silicon nitride, bonding strength between the oxide and non-oxide is improved; by virtue of the gunning mix disclosed by the invention, the service life of the main channel is prolonged.

The invention discloses a high-temperature-resistant toughened light-cured resin composition and a preparation method thereof. The composition contains the following raw materials: acrylic resin, epoxy resin, an active diluent, a free radical initiator 1, a free radical initiator 2, a cationic initiator, polyol, a leveling agent, an antifoaming agent, a wetting dispersing agent, nano-core-shell rubber, nano-silicon oxide and a pigment. According to the resin composition, the curing rate of high-temperature-resistant light-cured resin can be effectively increased, and the initial strength of a product is greatly enhanced; furthermore, the material further has relatively high tenacity, so that the operations of punching, screw drilling and the like can be realized on a sample. Therefore, the high-temperature-resistant toughened light-cured resin composition has the characteristics of high curing efficiency and initial strength, excellent high temperature resistance, good tenacity and stable dimension.

The invention relates to a preparation method of a light/humidity dual-curing polyurethane hot melt adhesive. The preparation method comprises the following steps of: introducing N2 into an HDI (hexamethylene diisocyanate) tripolymer, removing water vapor, carrying out a protective reaction, respectively adding a polymerization inhibitor and a catalyst and dropwisely adding HEA (hydroxyethyl acrylate); after dropwisely adding and reacting, adding polyisocyanate, and stirring uniformly to obtain 3HDI-HEA/polyisocyanate; heating and fusing polyalcohol and stirring for dehydration; adding the 3HDI-HEA/polyisocyanate and the catalyst; discharging after reacting, packaging the sample with an aluminum foil bag for standby application to obtain a light/humidity dual-curing polyurethane hot melt adhesive prepolymer; melting the prepolymer, and adding a photoinitiator, a polymerization inhibitor, a plasticizer and the catalyst, stirring uniformly in a molten state, rising the temperature and removing air bubbles; and ending stirring and discharging to obtain the light/humidity dual-curing polyurethane hot melt adhesive. The obtained hot melt adhesive has high initial bonding strength and final strength.

The invention relates to a high initial strength filling mining method. The method includes the following steps: crushing municipal garbage, mixing the garbage with a proportional curing agent and pressing the garbage into a filling material; transporting the prepared sealed filling material from the ground to the bottom of the well, and then shipping the filling material to a working face; after coal cutting, support advancing and pushing on the working face, sending the filling material from a gate top by using a mining flatbed truck, sending the filling material into a flexible rail behind a support through a rotating switch of an upper end, unloading the filling material to a goaf area, stacking regularly, and filling the remaining gap with a rapid hardening cement paste material to ensure complete roof contact; and after mining, sealing the goaf area again through boundary coal pillars and stop line coal pillars to ensure zero gas and liquid exchange between the filled area and the unfilled area. The method of the invention solves the problems of municipal garbage disposal and the sources for mining coal filling material, and the filling material has high initial strength and can effectively control the surface subsidence.

The invention discloses an industrial solid waste autoclaved aerated concrete block and a preparation method thereof. The concrete block uses fly ash, carbide slag, red mud, lime, desulfurized gypsumand cement as main raw materials and aluminum powder, sodium hydroxide, water glass and the dispersing agent silica fume as additives; the coal ash reacts with components in the carbide slag to generate ettringite, so the strength of the concrete block can be enhanced; a large amount of aluminum oxide contained in the red mud can a replace part of lime and undergo a hydration reaction with the cement, and the aluminum oxide in the red mud can react with calcium hydroxide in the carbide slag, so the strength of the block is enhanced; the coal ash, the carbide slag and the red mud react with oneanother to generate hydrated calcium silicate and hydrated calcium aluminate, so the structural compactness of the block can be improved; and the additives can enhance the foaming stability of the aluminum powder and improve the early strength of the block under an alkaline condition. The method is green and environment-friendly, and the waste of non-renewable resources is effectively reduced.

The invention discloses a detachable reactive polyurethane hot melt adhesive used for bonding of mobile phone frames. The adhesive is characterized by comprising the following components, in percentages by weight: 10-30% of a polyether polyol, 30-50% of a polyester polyol, 15-35% of isocyanate, 15-30% of acrylic resin, 3-10% of tackifying resin, 1-5% of thermoplastic polyurethane (TPU), 0.1-0.5% of a stabilizing agent, 0.1-1% of a catalyst, and 1-5% of an adhesion promoter. The invention also discloses a preparation method of the adhesive. The reactive polyurethane hot melt adhesive provided by the invention has low viscosity, good fluidity, easy dispensing and no drawing; the adhesive has good stability, and the viscosity change does not exceed 50% at 120 DEG C for 24 h; the adhesive hasa fast positioning speed and short pressure holding time; the adhesive has high bonding strength and very good bonding effects on a plurality of plastics and metals; and the adhesive is detachable.

A downhole tool member for hydrocarbon resource recovery, comprising a shaped body of a polyglycolic acid resin having a weight average molecular weight of at least 70,000, having an effective thickness which is ½ or more of a critical thickness of surface decomposition, and exhibiting a thickness reduction rate in water which is constant with respect to time. As a result, it has become possible to more accurately design the strength and time up to the collapse of the downhole tool member which forms the whole or a part of a downhole tool for developing or repairing downholes for recovery of hydrocarbon resources, such as oil and gas.

A stent includes a first tubular element formed of a first bioerodible metal composition and second tubular element formed of a second biodegradable metal composition. The first and second tubular elements are concentrically arranged; and the first and second bioerodible metal compositions are different

The invention discloses rice straw reinforced foam concrete and a method for preparing the same. The rice straw reinforced foam concrete comprises dry-basis gelling components. The dry-basis gelling components comprise, by weight, 15-75 parts of ordinary silicate cement, 10-25 parts of fly ash, 10-55 parts of mineral waste residue micro-powder, 5-15 parts of steel slag powder and the like. The method includes adding an appropriate quantity of water and foaming agents to prepare concrete slurry; adding modified rice straw fibers on the basis of the concrete slurry; carrying out mold filling, shaping and curing for 28 d to obtain the rice straw reinforced foam concrete which is reinforced and toughened foam concrete. The rice straw reinforced foam concrete and the method have the advantagesthat the rice straw reinforced foam concrete is light, heat-insulation and crack-resistant, is toughened, is quite suitable for mass concrete construction such as mine backfilling and also can be applied to producing novel wall materials, heat can be preserved by the rice straw reinforced foam concrete, dry shrinkage can be prevented, and the like.

The invention discloses a process of directly forming and utilizing coal slime of a coal cleaning plant. The process comprises the following steps: directly transporting the coal slime from a filter-pressing workshop of the coal cleaning plant to a dosing machine; adding a certain amount of raw coal and an adhesive in percentage by mass; adopting a double-roller forming machine or a screw extruder to form after stirring and uniformly mixing. According to the process disclosed by the invention, the filter-pressing coal slime is not needed to be dried, and can be directly transported to a forming site, so that the coal slime is prevented from occupying land and being polluted. The forming process is simple, a briquette coal product is good in mechanical strength, so that the calorific value of the coal slime briquette coal can be adjusted by matching with the raw coal, and therefore, the use requirements of different users are satisfied. The process disclosed by the invention can be used for effectively solving the problems that the coal slime of the coal cleaning plant is in excess of demand, occupies land, and is polluted.