51results about How to "Restricted free movement" patented technology

The invention relates to a polyamide composition with high dimensional stability and a preparation method thereof. The polyamide composition comprises the following components in parts by weight: 60 to 90 of fatty polyamide composition, 2 to 10 of compatilizer, 1 to 10 of inorganic metal compound, 0 to 5 of polysiloxane with low molecular weight and 0 to 2 of auxiliary agent. The preparation method comprises the following steps of: premixing the raw materials in a high-speed mixer for 10 to 30min, controlling the temperature to be 40 to 60 DEG C, then adding premix into a double-screw extruder, conveying, melting, shearing, extruding, cooling and granulating so as to prepare a polyamide composition product with high dimensional stability. Compared with the prior art, the invention shows excellent dimensional stability and heat distortion temperature with high retention rate, is suitable for occasions with higher requirement to the dimensional stability, such as the panel of the air conditioner of an automobile, an instrument panel, a camera bracket, a sports apparatus and the like, and can be directly processed by injection molding or other forming methods.

The invention relates to a nano-grade silica modified montmorillonite particle preparation method, and a method for applying the nano-grade silica modified montmorillonite particles in producing modified aqueous polyurethane resin with an in-situ method. According to the invention, tetraethoxysilane, a silicane coupling agent and montmorillonite are subject to a modification reaction, such that anano-grade silica layer is modified on the surface of montmorillonite, and active amino-groups are modified. Therefore, the compatibility of montmorillonite in aqueous polyurethane resin is better, such that the emulsion can be more stable. According to the invention, silica modified montmorillonite is prepared through an in-situ method, a silica layer comprising a large amount of silanol is modified on the surface of montmorillonite, and lamella parts of montmorillonite are peeled. When the modified particles are positioned in an aqueous polyurethane system, high molecular chains of polyurethane are subject to an intercalation reaction with montmorillonite, such that free movements of polyurethane molecular chains are restricted, and mechanical properties and thermal stability of the material are improved. Compared to simple polyurethane, tensile strength of the material is improved by 1-2 times, and thermal decomposition temperature of the material is improved by 30 to 50 DEG C.

The invention relates to a decoupling combustion device for the biomass briquetting fuel and the combustion method. The device comprises a vertical combustion furnace, a combustion chamber and a pyrolysis chamber; the bottom of the combustion chamber is communicated with the bottom of the pyrolysis chamber; a hopper is mounted on top of the pyrolysis chamber; a gate is mounted at the lower part of the combustion chamber. The invention is characterized in that a screw conveyor is mounted at the lower part of the pyrolysis chamber; a flue gas interlayer is mounted on the outside wall of the pyrolysis chamber, which is communicated with a flue gas channel at the lower part of the furnace body; an air duct is mounted at the lower part of the gate; a flue gas baffle is mounted in the combustion chamber; the upper part of the flue gas baffle is communicated with the flue gas interlayer. The method is combined with the combustion characteristic of the biomass briquetting fuel, which processes the pyrolysis and the combustion of the biomass briquetting fuel respectively in two areas with different temperature; the method alleviates the contradiction that the pyrolysis speed does not match with the combustion speed; the method eliminates the coupling of different pollutants in the generation process, reduces the loss of incomplete combustion and decreases the discharging amount of the pollutants such as CO and NOx through the re-organization of the combustion of the volatile and the char.

The invention discloses a quantum dot cascade laser, comprising a lower waveguide, a quantum dot active area layer and an upper waveguide. The quantum dot active area layer is of multi-period cascade, each period comprises multiple quantum wells/barriers and quantum dot intercalations, wherein the multiple quantum wells/barriers are used for regulating energy band structures so as to provide an electronic quantum conveying channel; and the quantum dot intercalations are used for realizing quantum dot participation sub-band lasing. In addition, a quantum well material of the quantum well/barrier is InxGa1-xAs, and x is larger than 0 and smaller than 1; and a quantum barrier material of the quantum well/barrier is InxAl1-yAs, and y is larger than 0 and smaller than 1. According to the quantum dot cascade laser disclosed by the invention, multiple quantum dot intercalations are guided to a suitable position in the quantum dot active area layer so that performance indexes of the quantum dot laser, such as power conversion efficiency, characteristic temperature and threshold density, are greatly improved.

The invention discloses a lithium battery diaphragm preparation method based on a mixed solvent multi-stage volatilization mechanism. The preparation method comprises the steps of performing heating dissolution on a certain mass of PVDF-HFP in a certain mass of first solvent, performing normal temperature dissolution on a certain mass of PVDF-HFP in a certain mass of first solvent, enabling the above two parts to be mixed uniformly and then adding a certain mass of second solvent, performing uniform mixing and than coating a base material, and carrying out drying to obtain the lithium batterydiaphragm. According to the preparation method, the PVDF-HFP is added into the first solvent in two times to form a cross-linked network structure with link; then the second solvent is added to dissolve a part of the link, and the dissolved partial link forms the cross-linked network structure to wind around the linkage; after drying, the first solvent is volatilized to form main lithium ion transmission holes; and the second solvent is volatilized to form holes in the cross-linked network structure around the link, so that the surrounding strength of the link of the lithium battery thin filmis reinforced, and the strength of the lithium battery diaphragm is further reinforced.

The invention discloses a silicon carbide/hafnium carbide nanowire modified silicon carbide coating enhanced graphene honeycomb-based nano aerogel heat-insulating and wave-absorbing composite material, which is composed of silicon carbide coating enhanced graphene honeycomb, silicon carbide/hafnium carbide nanowires and nano aerogel, firstly, a silicon carbide coating is prepared on the surface of a graphene honeycomb through a chemical vapor deposition process, and then internal pores of the graphene honeycomb are reinforced on the silicon carbide coating through a chemical liquid vapor deposition process to prepare the silicon carbide/hafnium carbide nanowire. And finally, nano aerogel is prepared on the surfaces of the silicon carbide/hafnium carbide nanowires through a sol-gel process, a supercritical drying technology and a carbonization reaction, a formed three-dimensional network structure can effectively block heat transmission and promote the absorption and dissipation effects on electromagnetic waves, and the heat insulation and wave absorption performance of the composite material is cooperatively provided.

The invention discloses a preparation method of an industrial silicone sealant. The silicone sealant is prepared from the following raw materials in parts by weight: 100-120 parts of alpha, omega-dihydroxypolydimethylsiloxane, 5-8 parts of a cross-linking agent, 3-5 parts of a catalyst, 3-5 parts of a coupling agent, 8-10 parts of a flame retardant and 10-15 parts of a high-temperature-resistant filler. The silicone sealant is used as a raw material, the flame retardant and the high-temperature-resistant filler are prepared, the flame retardant can generate a large amount of inorganic phosphoric acid during combustion, the silicone sealant is dehydrated and carbonized to form a carbon layer, the carbon layer can prevent invasion of oxygen and overflow of combustible gas, then matrix combustion is prevented, when the high-temperature-resistant filler and the flame retardant are mixed for use, the flame retardant effect of the silicone sealant is improved, meanwhile, the graphene oxide is of a quasi-two-dimensional limited structure, polymer molecules are bound between layers of the graphene oxide, free movement of molecular chains and segment chains is limited, and then the high temperature resistance of the silicone sealant is improved.

The invention discloses down-drilling-preventive textile and a production method thereof. The down-drilling-preventive textile comprises two or more layers of fabric. The production method includes adopting filaments as facial sutures; adopting another type of sewing threads, except for the filaments, as bottom sutures, sewing the fabric forming the textile to form a cavity, and filling a filler in the cavity. By improving the sewing facial sutures and the sewing bottom sutures, the sewing sutures are enabled to be less prone to causing down drilling in the process of sewing; the sewn position of the textile produced by the method is less prone to sliding during use, so that probability that the filler drills down through a needle hole channel is lowered effectively, and effect of down drilling prevention is realized.

The invention belongs to the technical field of road maintenance and particularly relates to a heavy load resistant anti-rut agent and a preparation method thereof. The preparation method disclosed by the invention comprises the following steps: washing rice husks, and heating and filtering with a sodium hydroxide solution so as to obtain a filter cake; washing, drying, maintaining the temperature and carbonizing so as to obtain the carbonized rice husk; sintering with sodium fluoride and nano iron powder and performing oxidation treatment; collecting calcined particles, mixing and standing with a hydrofluoric acid solution; filtering, and drying to obtain modified particles; mixing sodium hydroxide with a magnesium sulfate solution, and dispersing with the modified particles so as to obtain precursor slurry, carrying out a high-pressure reaction, and filtering to obtain filter residues; washing, drying, performing mixed extrusion granulation with natural rock asphalt, polyvinyl butyral, polycarbonate and the like; finally, cooling, so as to obtain the heavy load resistant anti-rut agent. According to the heavy load resistant anti-rut agent disclosed by the invention, the rut resistance of a concrete pavement under heavy load and high temperature conditions can be effectively improved, and the rut resistance is improved, therefore, the pavement rut diseases are effectively reduced.

The invention relates to a double-wall cooling blade, a turbine blade applying the cooling blade and a gas turbine. The double-wall cooling blade comprises a blade inner wall, a blade outer wall, a partition plate and heat exchange structures, wherein the blade inner wall is surrounded to form a high-pressure chamber; the blade outer wall is positioned on the outer side of the blade inner wall, and is detachably connected with the blade inner wall; the blade outer wall and the blade inner wall are surrounded to form an annular chamber; the partition plate is arranged in the annular chamber, and is used for dividing the annular chamber into a plurality of independent areas; the heat exchange structures are arranged in the independent areas; a plurality of impact holes for communicating the high-pressure chamber with the annular chamber are formed in the blade inner wall; and at least one row of cold air holes for communicating the annular chamber with the outside are formed in the blade outer wall. The double-wall cooling blade can solve the engineering application problem of a double-wall cooling structure.

The invention provides a condensate water dripping preventing structure at the water dripping pipe position of an evaporator. The condensate water dripping preventing structure comprises an evaporator core, an evaporator lower shell arranged at the outer portion of the evaporator core, a water dripping pipe communicating with the bottom of the evaporator lower shell, and a plurality of rib plates arranged on the bottom face of the evaporator lower shell. The multiple rib plates are parallel. The height of the multiple rib plates is 5 mm, the width of the multiple rib plates is 3 mm, and the distance between every two adjacent rib plates is 4.5 mm. The above structure is additionally arranged at the water dripping pipe position, so that when condensate water is separated out on the surface of the evaporator lower shell, free flowing of the condensate water on the evaporator lower shell is limited through the arrangement of the close rib plates; and the condensate water can freely evaporate, and the situation that little condensate water is accumulated and drips into a cab cannot happen. Meanwhile, an inner surface waterproof sponge can be omitted through the design, the technology that the sponge is bonded to the inner surface of the evaporator lower shell is omitted, cost is saved, and efficiency is improved.

The invention discloses a method and device for improving the stability of an examined part in the medical imaging examination process, and belongs to the technical field of medical imaging equipment.According to the method, after the body position of a patient is placed, the examined part of the human body is fixed in an adaptive fixing mode; the medical image is acquired, so as to be suitable for patients with different figures and body types and equipment with different models, and the device is simple to operate, firmer to fix and higher in comfort level. Due to the fact that the air bagwraps the porous elastic material, free circulation of air in the porous elastic material and the atmosphere is limited, after the air bag is connected with negative pressure, the air bag can flattenthe porous elastic material under the pressure of the atmospheric pressure, and the elastic potential energy of the porous elastic material is increased. After the air bag is communicated with the atmosphere, the elastic potential energy of the porous elastic material is gradually released to support the air bag, so that a high-pressure air source is not needed; high-pressure inflation is not needed after the air bag is placed in place, and operation is convenient; no air leakage or explosion risk exists in the image inspection process, and the safety coefficient is very high.

The invention discloses an anti-cracking seal rubber material which is prepared from the following raw materials in parts by weight: 2-4 parts of magnesium sulfate, 1-3 parts of barium metaborate, 0.3-1 part of bisphenol a diglycidyl ether, 2-4 parts of alkyl ketene dimer, 3-4 parts of anti-aging agent TNP, 26-30 parts of butyl methacrylate, 10-14 parts of graphene oxide, 1-2 parts of sodium borohydride, 3-4 parts of sulfanilic acid, 14-20 parts of 0.8-1 mol/L hydrochloric acid, 0.3-0.5 part of potassium persulfate, 0.5-1 part of hydrazine hydrate, 210-300 parts of cis-1,4-polybutadiene rubber, 1.7-2 parts of vulcanizing agent PM, 1-2 parts of tin monosulfide, 3-4 parts of glyceryl carboxylate, 2-3 parts of polyamide wax micropowder, 0.7-1 part of 4-dimethylaminopyridine, 10-14 parts of wollastonite powder and 0.7-1 part of silane coupling agent kh560. The rubber material has the advantages of favorable sealing property, high surface strength, favorable addition property, high cracking resistance and high impact resistance.

The invention discloses a polyanion zinc salt hydrogel electrolyte and a zinc battery system, the electrolyte is an organic acid zinc salt polymer, and is prepared from an organic matter monomer, a zinc salt, a cross-linking agent and an initiator through a polymerization reaction; wherein the concentration of the organic matter monomer is 0.1-10 mol/L, and the amount-of-substance concentration ratio of the organic matter monomer to the zinc salt is 0.1: 1-10: 1; the organic matter monomer contains a carbon-carbon double bond and contains at least one group of a sulfonic acid group, an imide group, a sulfonyl imide group, a carboxylic acid group and a boric acid group; the zinc salt is soluble zinc salt. According to the zinc battery system, polyanion zinc salt hydrogel electrolyte is adopted, negative ions in the electrolyte are fixed, side reactions are reduced, growth of zinc dendrites is inhibited, and the electrochemical performance and cycling stability of the zinc battery system are improved.