72results about How to "Small volume change rate" patented technology

The invention discloses a cement-emulsified asphalt self-permeable grouting material applied to semi-flexible pavement, which comprises 100 parts of cement, 50-150 parts of mineral admixture, 15-40 parts of expansion agent, 0-80 parts of river sand, 0.5-20 parts of water agent, 60-140 parts of water, and 50-150 parts of emulsified asphalt, all of which are parts by weight. The grouting material of the present invention is low in cost, good in fluidity, long in working time, and satisfies the grouting characteristics of self-permeation of slurry; has good interfacial bonding performance with asphalt, and has a certain early strength function; the volume change rate is small, and the degree of delamination is less than 0.3%, with good volume stability; both cationic emulsified asphalt and anionic emulsified asphalt can be used, with a wide range of applications; applying this grouting material to semi-flexible pavement can greatly improve the fatigue life of flexible pavement The shear performance is effectively improved.

The invention relates to the technical field of sealants, in particular to a solvent-resistant epoxy modified polyurethane sealant and a preparation method thereof. The sealant is prepared from, by weight, 20-40% of an epoxy modified polyurethane prepolymer A, 10-30% of a low-viscosity polyurethane prepolymer B, 29.4-59.4% of an inorganic filler, 0.01-30% of a thixotropic agent, 0.01-2% of a curing promoter, 0.01-2% of a water removal stabilizer and 0.01-2% of an adhesion promoter. The epoxy modified polyurethane sealant has excellent chemical corrosion resistance and mechanical properties, through a chemical corrosion test in the industry standard of a membrane-type gas meter, after liquid immersion, the mechanical properties, mass change rate and volume change rate of the sealant can allbe kept at a very small change rate, the adhesive sealing effect is good, and the sealant can keep the good adhesive sealing function during long-term use in the gas meter.

The invention relates to gypsum-based self-leveling mortar prepared by taking molybdenum tailings as filler. The gypsum-based self-leveling mortar is prepared from the following components in parts by weight: 50-70 parts of alpha gypsum, 30-45 parts of the molybdenum tailings, 0.1-0.2 part of a defoaming agent, 0.3-0.5 part of a water reducing agent, 1-3 parts of a volume stabilizer, 0-1 part of a coagulation time regulator, 0-1 part of a thickening agent and 0-1 part of a water repellent agent. The gypsum-based self-leveling mortar prepared by taking the molybdenum tailings as the filler has better strength and leveling property, and is lower in rate of volume change; the performance of the gypsum-based self-leveling mortar is improved, and the utilization rate of the molybdenum tailings is increased. The industrial solid waste-molybdenum tailings is utilized on the one hand, and the high-performance gypsum-based self-leveling mortar which meets the demands of grade level engineering is prepared on the other hand while the rapid development market demand of gypsum-based self-leveling is combined. The gypsum-based self-leveling mortar both meets the demand of comprehensive resource utilization and the demand of the grade level market.

The present invention provides a negative electrode for a nonaqueous electrolyte secondary battery, the negative electrode being produced at reduced costs, having a high graphite packing density, and having stable quality. The negative electrode according to the present invention includes a negative-electrode current collector; and a negative-electrode active material layer provided on the negative-electrode current collector, wherein the negative-electrode active material layer includes: flaky graphite particles formed by graphitizing needle coke; particulate graphite particles formed by graphitizing coke; and a binder.

The invention discloses a composite heat dissipation device adopting composite phase change materials and micro-channel liquid cooling, relates to the field of cold heat dissipation, in particular tothe heat dissipation device adopting combination of the phase change materials and the liquid cooling. The heat dissipation device comprises a phase change area cover plate, the phase change materials, a radiator and a liquid cooling area cover plate; the radiator is of a plate-shaped structure, a concave area for containing the phase change materials is formed in one side of the radiator, and a micro-channel is formed in the other side corresponding to the concave area; the phase change materials are packaged by the phase change area cover plate, the micro-channel is packaged by the liquid cooling area cover plate, and a liquid injection port and a liquid outlet of cooling liquid are formed in one side, which is not packaged, of the liquid cooling area cover plate; and the heat source isarranged on the unpackaged side of the phase change area cover plate. The composite heat dissipation device is characterized in that a plurality of columnar protrusions made of foamed aluminum materials are arranged in the concave area of the radiator in an array mode, gaps among the columnar protrusions in the concave area are filled with the phase change materials, and a circle of sealing grooveis formed in the outer side of the concave area. The composite heat dissipation device has the advantages of uniform heat dissipation and high heat dissipation efficiency.

The invention provides an amorphous alloy dental pulp file and a manufacture method thereof. Compared with the traditional dental pulp file prepared from a titanium-nickel memory alloy, the novel dental pulp file has excellent properties such as high strength, high hardness, high elasticity, high surface smoothness, high fatigue strength and the like as well as corrosion resistance; meanwhile, the manufacture method of the dental pulp file is simple, machining can be performed at a lower temperature, and the dental pulp file can be manufactured with methods such as twisting, rolling, weaving, impressing and the like.

The invention provides a thermosetting liquid optical adhesive composition and an application thereof; the thermosetting liquid optical adhesive composition is tested according to a GB/T 4509-2010 asphalt needle penetration determination method, and the needle penetration of the thermosetting liquid optical adhesive composition is 160-250 mm. The thermosetting liquid optical adhesive provided by the invention has proper needle penetration after being cured, is easy to repair, does not greatly fluctuate along with the influence of temperature, humidity, UV aging irradiation and the like, and has higher cohesion strength, better binding power and excellent binding power for a binding material of a display module.

The invention discloses a fluorine-silicon sealant for a fuel oil-resisting solvent part. The fluorine-silicon sealant is characterized by comprising the following components in parts by weight: 100 parts of hydroxyl end-capping fluorinated silicone rubber, 5-20 parts of white carbon black, 0-100 parts of nano calcium carbonate, 10-20 parts of a cross-linking agent, 1-5 parts of an accelerant, and 0.2-0.5 part of a curing agent. A preparation method for the sealant is characterized by comprising: preparing a base stock: adding the hydroxyl end-capping fluorinated silicone rubber, the white carbon black and the active nano calcium carbonate according to a formula, and stirring the mixture for one hour at a high speed in vacuum; preparing an auxiliary agent: uniformly mixing the tetraethylortho silicate, the accelerant and the catalyst according to the formula; and in use, adding 1 part of the auxiliary agent into 10 parts of the base stock, and uniformly stirring the mixture in vacuum to obtain the sealant. The product has good fuel oil resistance and excellent mechanical properties.

The invention relates to a heat-conductive rubber material for drilling tools and a preparation method thereof. The heat-conductive rubber material is composed of the following raw materials by weight: 90 to 100 parts of hydrogenated nitrile or nitrile rubber, 20 to 70 parts of carbon black, 5 to 15 parts of amorphous silica, 3 to 9 parts of an activator, 2 to 20 parts of a plasticizer, 2 to 10 parts of a vulcanizing agent, 1 to 5 parts of an anti-aging agent, 1 to 6 parts of a dispersing agent, 1 to 50 parts of a heat-conductive material and 10 to 15 parts of an ionic liquid. The rubber material provided by the invention has the advantages of excellent physical and mechanical properties, excellent heat conduction performance and dielectric barrier properties and low volume change rate inmud, and can effectively improve the temperature resistance of a main rubber material.

The invention belongs to the technical field of special cement, and particularly relates to a manganese slag supersulfate cement and a preparation method thereof. The manganese slag supersulfate cement is prepared from the components in percentage by weight: 30-40% of manganese slag, 25%-50% of granulated blast furnace slag powder, 10-20% of sulfates, 5%-10% of a sulfate activator, 1-5% of an alkaline component and 0.05-2% of an alkaline activator. The manganese slag which is a high-temperature slag waste discharged during the blast furnace smelting process of manganese iron or silicomaganeseis used as a main raw material, a material science principle is combined, the mineral characteristics of manganese slag and slag are taken as a basis, the potential hydration activity of the manganeseslag is activated by using sulfates and alkaline environment to form the initial strength, and novel manganese slag supersulfate cement with excellent properties is further designed.

The invention discloses a material for sealing a cathode steel bar of an aluminum electrolytic tank, which is prepared by mixing refractory particles, mixture of aluminum oxide powder and a refractory material, a binding agent and water according to a certain proportion, wherein the refractory particles account for 30-60% by weight, the mixture of the aluminum oxide powder and the refractory material accounts for 25-55% by weight, the binding agent accounts for 5-18% by weight and the water accounts for 7-15% by weight; the refractory particles adopt aluminum silicate particles or silicon oxide particles, and the binding agent adopts high aluminum cement or water glass; the required materials are poured into a stirring machine according to the proportion during the production, the stirring is firstly carried out for 3-5min for uniformly mixing and stirring the added materials, then an appropriate amount of the water is added for stirring for 5-10min, the stirring is stopped after confirming that the stirred materials have good flowability through visual observation, and then the materials are pouring into a container for preparation; and the material has simple production, good self-flowing property, convenient construction, good sealing performance and high temperature resistance.

A preparation method of a modified epoxy resin includes synthesis of spiro orthocarbonate performed polymer and a subsequent preparation of the modified epoxy resin. Prepared performed polymer with a synthesis molar ratio of 2:1, 3:2, 4:3 and epoxy resin are mixed in a beaker at room temperature, added and mixed well with a boron trifluoride ethylamine curing agent 3wt% of the resin; the beaker with the mixture in is mixed in an supersonic wave washer and placed in a vacuum baking oven for 2 h bubble removal. An expanding monomer performed polymer synthesized by the invention can effectively reduce volume contraction in the epoxy resin solidification process and has good expansion effect; besides a volumetric change rate in the epoxy resin solidification process decreases as a performed polymer content and a spiromonomer content in the performed polymer increase.

The invention provides a carbon-nitrogen material, a preparation method thereof, a lithium-sulfur battery cathode material containing the carbon-nitrogen material and a lithium-sulfur battery, and relates to the technical field of new energy batteries. The preparation method of the carbon-nitrogen material comprises the following steps: sintering a mixture of a catalyst and melamine in an inert atmosphere to obtain the carbon-nitrogen material. A carbon-nitrogen nanotube obtained with the preparation method can solve the technical problem of poor cycle stability of the lithium-sulfur battery due to high dissolubility of an intermediate product lithium polysulfide of the lithium-sulfur battery in an electrolyte in the prior art, and achieves the technical effect of improving cycle stabilityof the lithium-sulfur battery.

The invention provides a preparation method of a lithium manganate battery. A positive electrode active substance of the lithium manganate battery is spinel lithium manganate, and the molecular formula of the spinel lithium manganate is LiMn2-xMxO4, wherein x ranges from 0.01 to 0.1, M is a doped metal element; and a negative electrode active substance of the lithium manganate battery is a carbon-based material. The preparation method comprises the following steps: sieving the spinel lithium manganate material; respectively pulping the active substances under the screen and the active substances on the screen; coating the surface of a current collector with the obtained pulps in sequence; drying to obtain a positive electrode; putting the positive electrode and a counter electrode lithiumsheet into an electrolyte tank; discharging to a first preset voltage; taking out the positive electrode; assembling the positive electrode and a negative electrode clamping diaphragm into a batterycell; putting the battery cell into a shell, and carrying out injection molding to obtain the lithium manganate battery. The battery obtained by the preparation method disclosed by the invention is high in energy density, good in cycle performance and high in capacity retention ratio.

The invention discloses a novel insulated sealing material for a chemical pump and a manufacturing method of the novel insulated sealing material. The novel insulated sealing material is prepared fromthe following raw material components in parts by weight: 89-113 parts of an organic fluorine thermoplastic elastomer, 8.5-13.5 parts of Al2O3, 45.5-61.6 parts of methicone, 27-49.5 parts of polypropylene, 17-27.5 parts of barium sulfate, 0.05-0.2 part of tetraethylenepentamine, 0.1-0.2 part of hexafluorobisphenol A, and 0.05-0.2 part of sulfonated-1,3-dibenzyl-2-methylimidazole. The novel insulated sealing material does not need to be vulcanized or only needs to be locally vulcanized, and can be machined in a circulating mode to form a thermoplastic vulcanized rubber system. The novel insulated sealing material has the active effects that by adjusting a formula and a manufacturing process, the breakdown voltage of a blend rubber material is increased, and meanwhile, it is ensured that indexes such as the hardness, mechanical performance, corrosion resistance and insulation resistance of the material meet the using requirements of the chemical pump.

The invention belongs to the technical field of battery materials, and concretely relates to a method for preparing a magnesium ion battery positive electrode material. The magnesium ion battery positive electrode material is carbon coated magnesium ferrous borate, wherein the magnesium ferrous borate mainly comprises a magnesium source compound, a ferrous source compound and a borate radical compound. The magnesium ferrous borate synthesized from common raw materials in the invention is a novel magnesium ion battery positive electrode material having an extremely rich source and an excellentapplication prospect. Compared with currently widely studied phosphate polyanion compound magnesium ion battery positive electrode materials, the positive electrode material in the invention achievesa higher theoretic specific capacity by replacing a phosphate radical having a large mole with a borate radical having a small mole from structural analysis. The electric conduction capability of ferrous borate is stronger than that of ferrous phosphate, the volume change rate of the ferrous borate before and after discharge is lower than that of the ferrous phosphate before and after discharge and is less than half of that of the ferrous phosphate, so the magnesium ferrous borate positive electrode material has good rate performances and a good cycle stability.

The invention relates to a low-static-stiffness polyurethane microporous elastic backing plate with a low low-temperature static stiffness change rate, and belongs to the technical field of polyurethane microporous elastomers. The elastic base plate is a polyurethane microporous elastic base plate which is obtained by curing and forming a component A and a component B, the density of the polyurethane microporous elastic base plate is 400-450 kg/m<3>, and the static rigidity of the polyurethane microporous elastic base plate is (8 +/-0.8) kN/mm under the loading of 1-35 kN, the component A is prepared by uniformly mixing PTMEG 1000, PTMEG 2000, EP330, BDO, H2O, AK7703, BDMAE and T12, and the component B is a prepolymer which is formed by stirring and reacting a compound containing -NCO groups and polytetrahydrofuran ether polyol at the temperature of 80-100 DEG C for 4-6 h and has the NCO value of 12-15. By optimizing the raw material components and the component content in the elastic base plate and properly increasing the pressure in micropores in the elastic base plate, the elastic base plate has good cold resistance on the premise of meeting the use requirements of other indexes such as static rigidity, dynamic and static rigidity ratio and the like; therefore, the low-static-stiffness polyurethane microporous elastic base plate for the urban railway passenger transport line, which meets various index requirements, is obtained.

The invention relates to a lithium ion battery diaphragm prepared from an inorganic-organic composite material. The lithium ion battery diaphragm comprises at least two layers of polyolefin-based porous membranes which are stacked in sequence, and two adjacent layers of polyolefin-based porous membranes are bonded and fixed through an inorganic-organic composite material liquid; wherein the inorganic-organic composite material liquid is prepared from the following components in parts by weight: 30 to 50 parts of polyolefin emulsion, 5 to 10 parts of adhesive, 3 to 8 parts of nanoscale modifiedcomposite fiber, 0.2 to 0.5 part of dispersing agent and 0.1 to 0.5 part of plasticizer. The prepared lithium ion battery diaphragm is relatively stable in performance, is particularly applied to a lithium ion battery for an electric vehicle, and can tolerate relatively high temperature in the working process of the electric vehicle, and the diaphragm shrinkage rate is remarkably reduced comparedwith that of an existing polyolefin-based diaphragm, so that the overall service life of the battery is remarkably prolonged, and the safety is greatly improved; and the use convenience, the safety and the stability of the electric product are also improved.