34results about How to "Improve anti-separation performance" patented technology

The invention relates to a vortex generator structure for suppressing boundary layer separation under the action of shock waves. One or more vortex generator structures arranged in parallel are arranged, so that a flow control device is obtained. The flow control device aims at improving separation-resistant capacity of boundary layers in ultrasonic gas flowing under the action of the shock waves. A vortex generator is of a tetrahedral structure basically and is located in an interference region upstream boundary layer where shock wave boundary layers interact, the distance between a vortex generator trailing edge and an interference region initial point is 15-30 times of a boundary layer thickness when no control exists in the position where the vortex generator is located, the height of the vortex generator trailing edge is 0.3-0.8 time of a boundary layer thickness when no control exists in the position where the vortex generator is located, the length is directly proportional to the trailing edge height of the vortex generator, the specific value of the length to the trailing edge height is 5 to 10, the width is directly proportional to the trailing edge height of the vortex generator, the specific value of the width to the trailing edge height is 2 to 4, the distance between vortex generators is directly proportional to the trailing edge height of the vortex generator, and the specific value of the distance to the railing edge height is 6 to 10. The vortex generator structure is suitable for supersonic flow fields where the shock waves induce separation of boundary layers.

The invention discloses a polycarbonate / styryl resin composition which has light fastness and aging resistance and a preparation method thereof. The components and mixture ratio (weight proportion) of the composition are that: 50 percent-80 percent of polycarbonate, 10 percent-50 percent of styryl resin, 0.1-5 percent of molecular sieve, 0.1-1.0 percent of antioxidant 168, 0.1-1.0 percent of antioxidant 245, 0.1-2.0 percent of ultraviolet absorber, 0.1-2.0 percent of free radical quencher, etc. The resin composition prepared by the technical proposal of the invention can not only improve the anti-precipitation efficiency of light stabilizer in a composite material system to lead the prepared polycarbonate / styryl resin composition has better light fastness and aging resistance performance, but also has the advantage that all the physical mechanical performances and thermodynamic property of the material are basically not affected; furthermore, the method presented for improving the light fastness and aging resistance of polycarbonate / styryl resin composition has simple preparation technique and low production cost.

The invention discloses a polypropylene composite material that has excellent light and aging resistant performance and a preparation method thereof. The polypropylene composite material that has excellent light and aging resistant performance consists of raw materials comprising 55 to 95wt percent of polypropylene, 0 to 40wt percent of inorganic filler, 0 to 20wt percent of toughener POE, 0.1 to 5wt percent of molecular sieve activator powder, 0.1 to 1wt percent of main chemical inhibitor, 0.1 to 1wt percent of secondary chemical inhibitor, 0.1 to 2wt percent of light stabilizer agent and 0 to 5.0wt percent of other additives. By adding powder molecular sieve into basic formulation of the polypropylene composite material, the dispersibility of the light stabilizer agent in the polypropylene composite material is effectively improved, thus improving the light and aging resistant performance of the polypropylene composite material.

The invention provides liquid metal carboxylate. The liquid metal carboxylate is prepared with the following method: mixed acid is mixed with a metal precursor, an organic solvent and a phase transfer catalyst, and the mixture is reacted at the temperature of 80-130 DEG C for 2-4 h; a reaction liquid is subjected to decompression dehydration and is filtered, and a filtrate is collected, and the liquid metal carboxylate is obtained. An acyclic polyether transfer catalyst is introduced into the preparation process of the liquid metal carboxylate, the reaction efficiency of fatty acid salt can be effectively improved, the acid value of the reaction end point is reduced, and the reaction yield is improved; the liquid metal carboxylate can be applied to preparation of a composite PVC (polyvinyl chloride) heat stabilizer, and the thermal stability and the precipitation resistant performance of the composite PVC heat stabilizer system can be improved.

The invention relates to the technical field of wood plastic composite materials and particularly relates to a halogen-free flame-retardant PBT / PP (polybutylece terephthalate / propylene)-based wood plastic composite material and a preparation method thereof. The wood plastic composite material is prepared from the following raw materials in parts by weight: 20-30 parts of polybutylene terephthalate, 10-20 parts of propylene, 28-35 parts of melamino-formaldehyde modified plant fibers, 18-23 parts of coated ammonium polyphosphate, 1-3 parts of a 4A molecular sieve, 4-8 parts of maleic anhydride grafted polyolefin, 2-3 parts of a lubricant, 0.2-0.5 part of an antioxidant and 0.2-0.5 part of a light stabilizer. The wood plastic composite material provided by the invention is high in mechanical strength, and vertical combustion of a sample bar which is 1.6mm thick passes UL-94V-0 grade, the tensile strength reaches 36.3MPa, the bending strength reaches 48.8MPa, the thermal deformation temperature is 144.8 DEG C, and the long-term using temperature reaches up to 120 DEG C.

The invention discloses a polyvinyl chloride sealing strip composition and a preparation method thereof, and belongs to the technical field of processing and application of polymer materials. The polyvinyl chloride sealing strip composition comprises, by weight, 100 parts of PVC resin, 95-97 parts of a plasticizer, 4-5 parts of a calcium-zinc stabilizer, 0.2-0.3 part of an antioxidant, 18-20 partsof a filler and 0.3-0.5 part of a lubricant; and the plasticizer is a polyester plasticizer and carbon dioxide-based polymer compound. The polyvinyl chloride sealing strip composition has high anti-precipitation performance, the adhesion stress of a PCM plate is 9.5-10.5 N, and the preparation method can meet 80 m / min high-speed extrusion production, and improves the production efficiency.

At least one of a center electrode and a ground electrode of a spark plug includes an electrode body, an electrode tip, and a welded portion formed between the electrode body and the electrode tip. The electrode tip includes a cover layer that covers at least a side surface of a tip body, and the cover layer is formed of IrAl. On a section formed by cutting the electrode tip near a boundary with the welded portion, an area of the tip body is represented by Sa. An area of a projection on the section of a non-contact portion of an opposite surface of the tip body not in contact with the welded portion is represented by Sb. In this case, Sa−Sb corresponds to 35% or more of Sa.

The invention relates to a methanol gasoline prepared by means of coal-based light oil. The methanol gasoline comprises, by weight, 35.7-40.2% of distillation component oil, 11.96-30.4% of methyl alcohol, 1.04-1.6% of complex solubilizer, 17-17.4% of national standard 90# gasoline, 14.28-14.62% of aromatic hydrocarbon and 1.02-2.78% of additives. Raw materials of the methanol gasoline are rich and easy to obtain, high economic advantages are obtained, and the methanol gasoline has the advantages of being environmentally friendly, saving energy and being high in power performance.

The invention discloses frame sealing glue, a preparation method thereof and a display panel. The frame sealing glue comprises a frame sealing glue solution and conductive fibers dispersed in the frame sealing glue solution, and the conductive fibers are in a three-dimensional spiral shape. The frame sealing glue has excellent conductivity, high packaging quality, and excellent toughness and packaging bonding strength after being cured, and the separation resistance of two substrates of the box is improved. The preparation method of the frame sealing glue can ensure that the prepared frame sealing glue is stable in performance and high in efficiency. The display panel contains the frame sealing glue, and is stable in display and long in service life.

The present invention relates to a method capable of utilizing suction to raise compressor cascade load. Said method includes the following several main steps: according to the blade moulding surface geometric parameter utilizing hydro mechanical calculation method to calculate cascade flow field and obtain blade back MACH-number distribution curve; according to said curve defining suction peak position; according to the blade moulding surface geometric parameter calculating cascade flow field to obtain blade back separation zone starting position; according to blade moulding surface treating blade moulding surface; in the blade back suction peak position setting blowing section; according to theory and numerical research result selecting and defining blowing opening width; in the blade back separation zone starting position setting suction section; according to theory and numerical research result selecting and defining suction opening width, so that said method can greatly raise load of blade and can reduce loss coefficient.

A door and window sealing strip composition comprises the following parts by weight of raw materials: 60 to 80 parts of chlorinated polyethylene; 20 to 40 parts of polyvinyl chloride; 10 to 20 parts of a plasticizer; 2 to 3 parts of magnesium oxide; 3-6 parts of a calcium and zinc compound stabilizer; 0.5-1 part of stearic acid; 0.5-1 part of paraffin; 0.5-1.5 part of a peroxide crosslinker; 0.5-1part of a titanate coupling agent; 30 to 40 parts of calcium carbonate and 2 to 3 parts of carbon black. The door and window sealing strip composition has high anti-precipitation performance, can meet high-speed extrusion production of 80 m / min, improves production efficiency, has high tensile strength and low temperature embrittlement resistance, and is suitable for use in low temperature areas.

The invention relates to an embedded shearing resistant connector for steel web prestress concrete slab-composite slab, which comprises a plurality of rectangular steel sheets and steel webs (the shapes of the steel webs are various), wherein the rectangular steel sheets are welded onto the upper sides and the lower sides of the steel webs and are vertical to the steel webs; the rectangular steel sheets are welded to the steel webs (the welding properly adopts laser welding or arc welding, and carbon dioxide shield welding on the premise of ensuring the quality). According to the invention, the shearing resistant connector effectively plays the role of shearing prevention, the grappling length of the steel webs is effectively increased, the cohesion of concrete of the steel webs is increased, and the separation resistance of the concrete and the steel webs is improved. The connector is convenient to process, quick in welding, automatic in production and very practical for the type of stacking boards, has higher popularization value, is provided with good performance of fatigue resistance, and can resist the action of pull and push.

The invention discloses an air flow control device, a fan blade comprising the same and a wind generating set. The air flow control device comprises at least one control unit, the control unit comprises two oppositely arranged vertical plates and an exhaust assembly, the distance between the two vertical plates is gradually increased from front to back, the exhaust assembly is provided with an exhaust hole capable of spraying gas, and the exhaust hole is formed in the rear side area between the two vertical plates. According to the air flow control device, air flow flowing through the surfaceof a fan blade flows through the area between the two vertical plates to generate vortex, external energy of a boundary layer of the fan blade is mixed into the boundary layer, internal energy of theboundary layer is increased, the vortex center of the vortex is driven to move downwards through the air flow sprayed out of the exhaust hole of the exhaust assembly, thus energy mixing of the boundary layer is enhanced, internal energy of the boundary layer is further increased, and separation resistance of the boundary layer is improved.

In a pneumatic tire, a modulus at 300% elongation of a cap tread ranges from 3.0 Mpa to 7.0 Mpa, and the modulus at 300% elongation of an undertread ranges from 10.0 Mpa to 20.0 Mpa. Additionally, an earthing tread is made from a rubber material with a volume resistivity of 1×10{circumflex over ( )}7 Ω·cm or less. The earthing tread is made from the same rubber material as the undertread and has an integral structure with the undertread.

The invention relates to an acrylonitrile- butadiene- styrene ternary copolymer resin material (ABS) which has excellent resistance properties to sunlight and ageing. The components (weight percentage) are that: 100 percent of ABS, 0.1-5 percent of molecular sieve, 0.1-1.0 percent of antioxidant 168, 0.1-1.0 percent of antioxidant 245, 0.1-2.0 percent of ultraviolet absorber, 0.1-2.0 percent of free radical quencher, etc. The preparation method is that: the compound which comprises the addition agents of the ABA, the molecular sieve, the antioxidant 168, the antioxidant 245, the ultraviolet absorber, the free radical quencher, etc. is uniformly mixed by a high-speed mixer at a high speed and then melted and extruded out by a double screw extruder for granulation. The method has the advantages of simple preparation technology, low manufacturing cost, excellent physical and chemical combination properties of the materials, excellent resistance properties to sunlight and ageing, etc.

The invention discloses an air flow control device and a fan blade and a wind power generating set including the same. The air flow control device includes at least one control unit, and the control unit includes two oppositely arranged vertical plates and an exhaust assembly. The distance between the plates gradually increases from front to back, and the exhaust assembly has exhaust holes capable of injecting gas, and the exhaust holes are arranged in the rear area between the two vertical plates. The air flow control device of the present invention makes the air flow flowing through the surface of the fan blade flow through the area between the two vertical plates to generate vortex, blends the external energy of the boundary layer of the fan blade into the inside of the boundary layer, and increases the energy inside the boundary layer. Energy, and then the airflow ejected through the exhaust hole of the exhaust component drives the vortex center to move down, thereby strengthening the energy mixing of the boundary layer, further increasing the internal energy of the boundary layer, and improving the anti-separation ability of the boundary layer.

The invention relates to a vortex generator structure for suppressing boundary layer separation under the action of shock waves. One or more vortex generator structures arranged in parallel are arranged, so that a flow control device is obtained. The flow control device aims at improving separation-resistant capacity of boundary layers in ultrasonic gas flowing under the action of the shock waves. A vortex generator is of a tetrahedral structure basically and is located in an interference region upstream boundary layer where shock wave boundary layers interact, the distance between a vortex generator trailing edge and an interference region initial point is 15-30 times of a boundary layer thickness when no control exists in the position where the vortex generator is located, the height of the vortex generator trailing edge is 0.3-0.8 time of a boundary layer thickness when no control exists in the position where the vortex generator is located, the length is directly proportional to the trailing edge height of the vortex generator, the specific value of the length to the trailing edge height is 5 to 10, the width is directly proportional to the trailing edge height of the vortex generator, the specific value of the width to the trailing edge height is 2 to 4, the distance between vortex generators is directly proportional to the trailing edge height of the vortex generator, and the specific value of the distance to the railing edge height is 6 to 10. The vortex generator structure is suitable for supersonic flow fields where the shock waves induce separation of boundary layers.

The invention provides preparation and application of high-purity lavender oil, the high-purity lavender oil is prepared by selecting a distillation method to assist a filter membrane, and the pretreated filter membrane is subjected to soaking and plasma activating treatment, so that the filtering interception capacity of the filter membrane is greatly improved, impurities in the lavender oil are filtered out, and the purity of the lavender oil is improved. The purity of the lavender oil is further improved; a specific clarifying agent is matched with lavender oil, the problem that the clarity of the lavender oil is reduced after the lavender oil is stored for a period of time is solved, a compound stabilizer is specifically added, an auxiliary agent is blended with fatty acid polyoxyethylene ether, soybean phospholipid, tween-20 and epoxidized soybean oil which have a stabilizing effect, and then the mixture is added into the lavender oil, so that the lavender oil is obtained. The negative influence of the lavender oil stabilizing system caused by the use of the clarifying agent is solved, the precipitation resistance of the lavender oil is improved, and the storage stability of the lavender oil is greatly improved; the prepared high-purity lavender oil can be used for skin care.

The invention discloses a flexible lithium ion battery which structurally comprises a metal net current collector, and an electrode material layer, a solid electrolyte layer, a second electrode material layer, a second metal current collector layer and a flexible packaging material layer which are sequentially deposited on a metal net in a certain mode. Particular patterns of the composite structure and related material coatings of the lithium ion battery device on the metal mesh impart flexibility and foldability to the energy storage device.

The invention relates to a methanol gasoline prepared by means of coal-based light oil. The methanol gasoline comprises, by weight, 35.7-40.2% of distillation component oil, 11.96-30.4% of methyl alcohol, 1.04-1.6% of complex solubilizer, 17-17.4% of national standard 90# gasoline, 14.28-14.62% of aromatic hydrocarbon and 1.02-2.78% of additives. Raw materials of the methanol gasoline are rich and easy to obtain, high economic advantages are obtained, and the methanol gasoline has the advantages of being environmentally friendly, saving energy and being high in power performance.

The invention relates to an embedded shearing resistant connector for steel web prestress concrete slab-composite slab, which comprises a plurality of rectangular steel sheets and steel webs (the shapes of the steel webs are various), wherein the rectangular steel sheets are welded onto the upper sides and the lower sides of the steel webs and are vertical to the steel webs; the rectangular steel sheets are welded to the steel webs (the welding properly adopts laser welding or arc welding, and carbon dioxide shield welding on the premise of ensuring the quality). According to the invention, the shearing resistant connector effectively plays the role of shearing prevention, the grappling length of the steel webs is effectively increased, the cohesion of concrete of the steel webs is increased, and the separation resistance of the concrete and the steel webs is improved. The connector is convenient to process, quick in welding, automatic in production and very practical for the type of stacking boards, has higher popularization value, is provided with good performance of fatigue resistance, and can resist the action of pull and push.

The invention belongs to the technical field of APP modification, and provides APP which is resistant to migration and precipitation under high-temperature and high-humidity conditions in an acrylic emulsion textile coating and a preparation method thereof. The preparation method of the anti-migration and anti-precipitation APP comprises: adding APP powder to the water under stirring state, then dropwise adding a coupling agent whose addition amount is 2-10% of the mass of APP powder, and stirring for 0.5-10% after the dropping is completed. After 5 hours, the mixture was obtained, and then the mixture was filtered until no obvious water droplets existed, and the filtered powder obtained after filtration was dried until there was no moisture. The preparation method is aimed at modifying APP in a specific use environment, and improving the anti-migration and anti-precipitation capabilities of the APP flame-retardant acrylic emulsion textile coating in a high-temperature and high-humidity environment. APP prepared by the above preparation method. When the APP is used in the acrylic emulsion textile coating, it can be precipitated and migrated under higher temperature and humidity conditions.

At least one of a center electrode and a ground electrode of a spark plug includes an electrode body, an electrode tip, and a welded portion formed between the electrode body and the electrode tip. The electrode tip includes a cover layer that covers at least a side surface of a tip body, and the cover layer is formed of IrAl. On a section formed by cutting the electrode tip near a boundary with the welded portion, an area of the tip body is represented by Sa. An area of a projection on the section of a non-contact portion of an opposite surface of the tip body not in contact with the welded portion is represented by Sb. In this case, Sa−Sb corresponds to 35% or more of Sa.

The invention provides liquid metal carboxylate. The liquid metal carboxylate is prepared with the following method: mixed acid is mixed with a metal precursor, an organic solvent and a phase transfer catalyst, and the mixture is reacted at the temperature of 80-130 DEG C for 2-4 h; a reaction liquid is subjected to decompression dehydration and is filtered, and a filtrate is collected, and the liquid metal carboxylate is obtained. An acyclic polyether transfer catalyst is introduced into the preparation process of the liquid metal carboxylate, the reaction efficiency of fatty acid salt can be effectively improved, the acid value of the reaction end point is reduced, and the reaction yield is improved; the liquid metal carboxylate can be applied to preparation of a composite PVC (polyvinyl chloride) heat stabilizer, and the thermal stability and the precipitation resistant performance of the composite PVC heat stabilizer system can be improved.

A frame sealant composition, a preparation method thereof and a display device. The frame sealant composition comprises 1.7%-2.1% of carbon nanotubes modified by silane coupling agent, based on the total weight of the frame sealant composition. The preparation method of the frame sealant composition comprises mixing the carbon nanotubes modified by silane coupling agent with the other components of the frame sealant composition to form a stirring mixture, then kneading the stirring mixture, and finally deaerating the kneaded mixture. The adhesive strength of the frame sealant composition may be increased by using the method.

The invention belongs to the technical field of organic silicon high polymers and discloses polyeugenol-phenylsilsesquioxane. Polyeugenol-phenylsilsesquioxane has a structure as follows: the formula is shown in the description, wherein the sum of X, Y, Z and W is 10 to 40 and the sum of the Y, the Z and the W is greater than 1. The invention further discloses a preparation method of polyeugenol-phenylsilsesquioxane; the preparation method comprises the following steps: firstly, taking thiopropyl trialkoxy silane and phenyltrialkoxysilane to react, so as to obtain polythiol-phenylsilsesquioxane; then taking polythiol-phenylsilsesquioxane and eugenol to be subjected to thiol-alkene click chemical reaction to obtain polyeugenol-phenylsilsesquioxane; adding polyeugenol-phenylsilsesquioxane into polycarbonate, and melting and copolymerizing through an ester exchange method to obtain a polycarbonate-polysilsesquioxane copolymer; polyeugenol-phenylsilsesquioxane has good weather resistance and flame-retarding performance, and the impact strength and precipitation resistance of a material are improved.