290results about How to "Small coefficient of friction" patented technology

The invention provides a process for preparing a new plastic, which comprises the following steps: (1) preparing raw materials; (2) weighing and proportioning the raw materials; (3) mixing PVC powder, stabilizers, packing, plasticizers and other additives, then carrying out high-speed kneading on the obtained mixture, and preplasticizing the mixture so as to obtain a pre-plasticized mixture; (4) mixing the pre-plasticized mixture with TPU particles, carrying out banbury mixing on the obtained mixture under the condition of gradient temperature control so as to obtain colloidal products; (5) carrying out double-screw granulation on the obtained colloidal products; and (6) carrying out sorting, dehydration and packing on the granular products obtained in step 5 so as to obtain the new plastic. The process is simple, the conditions of the process are easy to control, and the process is suitable for large-scale production. The invention also provides a new plastic, which has the characteristics of high resistance to wear and scrape, high elasticity, easy recovery, high flame retardance, ultraviolet resistance, freezing damage (caused by low temperature in the north) resistance, environmental protection, soft handfeel and stick resistance, and the like; and the new plastic can be applicable to wire and cable compound.

The invention relates to an aqueous dull finishing coat with scratch resistance, a preparation method and a use method thereof. Main varnish is prepared from the following components in parts by weight: 60-80 parts of acrylic acid emulsion, 0.5-3 parts of thickening agent, 0.1-1.0 part of defoaming agent, 5-10 parts of glass powder, 0.1-1.0 part of foam inhibitor, 3-8 parts of filming auxiliary agent, 0.1-1.0 part of dispersant, 0.1-0.5 part of wetting agent, 1.0-3.0 parts of extinction powder, 0.5-3.0 parts of wax pulp and 1-20 parts of water; a curing agent of the aqueous dull finishing coat is mixed by 80 parts by weight of aliphatic polyisocyanate and 20 parts by weight of propylene glycol methyl ether acetate; and the ratio of curing agent NCO to main varnish OH is 2.5. The main varnish is prepared by the steps of adding the acrylic acid emulsion into a container, adding the thickening agent, the defoaming agent, the foam inhibitor and the dispersant under stirring, and dispersing at 500RPM for 5-8 minutes till being uniform; afterwards, after adding the extinction powder, the glass powder and the wax pulp under stirring, dispersing at 1000RPM for 15 minutes till the fineness is not more than 25mum; and then, adding the wetting agent, the filming auxiliary agent and the water, dispersing at 500RPM for 10 minutes till being uniform and filtering by a sieve with 100 meshes so as to obtain the aqueous dull finishing coat. The aqueous dull finishing coat is used by mixing in the weight mixture ratio of the main varnish to the curing agent to tap water being 100:50:20. A varnish film has very good hardness, toughness, scratch resistance, abrasion resistance and weather resistance, can be recoated without blanching and has especially good chemical resistance.

The invention relates to transparent matt polyurethane varnish. The preparation method of the varnish comprises the following steps: according to weight percentage, 40 to 60 percent of alkyd, 10 to 40 percent of elastic resin and 0.3 to 1.0 percent of a dispersant are sequentially added and are dispersed at the speed of 500 revolutions per minute for 3 to 5 minutes to evenness; while stirring, 2.0 to 5.0 percent of flatting powder, 3.0 to 10 percent of glass powder and 0.5 to 2.0 percent of wax powder are added and are dispersed for 15 minutes at the speed of 1,000 revolutions per minute till the fineness is less than or equal to 25 mu m; 0.2 to 0.5 percent of a leveling agent, 0.2 to 0.5 percent of an antisettling agent and 13.6 percent of a mixed solvent are sequentially added and are dispersed for 10 minutes at the speed of 800 revolutions per minute; 1.0 to 5.0 percent against 20 percent scratch resistant resin which is pre-dispersed is added into a varnish material obtained by the steps under the low-speed stirring; and after adding, the varnish material is dispersed for 10 to 15 minutes at the speed of 500 revolutions per minute to evenness and is filtered to obtain the transparent matt anti-scratch polyurethane varnish. The crosslinking density NCO/OH of the varnish and a curing agent is between 1.0 and 1.1; and the curing agent is mixed by the following compositions in weight percentage: 25 percent of aliphatic poly-isocyanate, 45 percent of aromatic poly-isocyanate and 30 percent of anhydrous butyl acetate. The varnish has good scratch resistance and high hardness; and a varnish film has smooth hand feeling, good transparence, does not blanch basically, has good storage stability and can be recoated.

A two-wheel electric vehicle with ringlike, large, powered parallel wheels, in which at least one ringlike wheel is driven by a large toroidal electric motor. The fully circular rotor of the large toroidal electric motor is integrated with the hub of the ringlike wheel, while the circular or semi-circular toroidal stator is joined to the body of the two-wheel electric vehicle, the ringlike wheel and the toroidal electric motor having a common bearing. The electric power source to drive the toroidal electric motor is located near the ground-facing portion of the vehicle body. An opening is formed in the internal circular area of the toroidal stator, to allow the entry and exit of the passengers of the vehicle. A similar small vehicle with parallel, coaxial wheels allows the occupant of the small vehicle to travel, seated either facing the conventional front or the rear of the small vehicle.

A wheel truck for a railroad car, including: a front wheel pair assembly and a rear wheel pair assembly; two side frame assemblies, each side frame assembly including a square box and journal-box guides; two spring suspension devices; and a bolster assembly including two ends disposed on the two spring suspension devices, respectively. The bolster assembly includes a pilot hole in the center and two mounting holes on the two ends, the pilot hole is rotationally matched with a cylindrical upper center plate of a car body for transmitting vertical and horizontal forces from the car body, and the two mounting holes are disposed above the two spring suspension devices, respectively. Each mounting hole receives a lower side bearing, and the lower side bearing is matched with a corresponding upper side bearing disposed on each side of the car body for transmitting the vertical load from the car body.

The invention is a high-wearability attapulgite clay reinforced polytetrafluorethylene composite, composed of attapulgite clays and polytetrafluorethylenes, and its characteristic: the content of the attapulgite clays is 20-1 wt% and that of the polytetrafluorethylenes is 80-99 wt%. Compared with existing techniques, the composite has lower friction coefficient and excellent wearability and mechanical property, applied in self-lubricating wearable parts in many fields, such as aviation, spaceflight, machinery, electronics, automobiles, home appliances, office, communications, etc. For the parts without considering oil stain pollution, after the composite are processed by oil dipping, it can obtain better wearability and lower friction coefficient.

The invention discloses a high gloss high abrasion resistance ultra-violet (UV) curing overprinting varnish of mobile phone and a preparation method thereof. The method of the invention uses low-viscosity polyester acrylate and aliphatic polyurethane acrylate as base resin which combines with ethoxylated pentaerythritol tetraacrylate, Trimethylolpropane triacrylate, Tri(propylene glycol) diacrylate, 1,6-hexanediol diacrylate and 2-ethylhexyl acrylate which are used as active diluent, alcohol and ethyl acetate which are used as diluent, benzophenone and 1-hydroxycyclohexyl phenyl ketone which are used as photoinitiator, reactive amine coinitiator, defoaming agent, flatting agent, slip agent and other agents to mix evenly and prepare the UV overprinting varnish. The overprinting varnish of the invention adopts the special raw material formula and has good lustrousness, adhesive force and mechanical stability; as some polyfunctional resins and resins with special functional groups are added, the crosslink density of the UV varnish is increased in the curing process and the hardness of the product is up to 5-7H; and as solid wax powder used as the slip agent is added, the coefficients of friction can be reduced and the product can have extremely high wear resistance.

Disclosed is a composite polarizing plate wherein a transparent protection layer (40) is formed on one side of a polarizer (30) which is composed of a polyvinyl alcohol resin and a retardation film (20) composed of a polypropylene resin is bonded to the other side of the polarizer (30), which is opposite to the side on which the transparent protection layer (40) is formed. The retardation film (20) composed of a polypropylene resin may be made of a homopolymer of propylene, or alternatively made of a copolymer with another monomer which mainly consists of propylene. A liquid crystal display is obtained by arranging this composite polarizing plate on at least one side of a liquid crystal cell (50).

The invention relates to a method for preparing wear-resistant thermoplastic olefin hydrocarbon compound, which comprises: first, chemical grafting modification is carried out on thermoplastic olefin hydrocarbon polymer in an initiation system by silane coupling agent under the condition that peroxide initiator exists, thus leading the thermoplastic olefin hydrocarbon polymer to take along alkoxy or chloro-silane branched chain; polysiloxane which has super high molecular weight and H+ active group on at least one end is mixed together with the thermoplastic olefin hydrocarbon polymer which is processed by grafting modification in a melt extrusion way, so that hydrogen bond connection is formed between the polysiloxane with super high molecular weight and the polymer silane branched chain to obtain the thermoplastic olefin hydrocarbon compound. The method greatly improves the compatibility between the polysiloxane with super high molecular weight and the thermoplastic olefin hydrocarbon compound, thus the adding quantity of the polysiloxane can be increased by about ten times, and the long-term wearing resistance of the products can be improved. After being rubbed for 10,000 times, the product has the friction depth being about half of the traditional technical product added with wear resistant addition agent, and the static state friction coefficient and the dynamic friction coefficient being 10% more than the traditional blending technical product.

A tapered roller bearing includes: an inner ring; an outer ring; a plurality of tapered rollers which are rollably disposed between the inner ring and the outer ring; and a retainer which retains the tapered rollers at predetermined circumferential intervals. In this tapered roller bearing, a roller coefficient {γ=(the number of rollers×average roller diameter) exceeds 0.94, a number of indentations having a micro recess-like shape are randomly provided at least on a surface of the tapered roller, a surface roughness parameter Ryni of the surface having the indentations falls within a range of 0.4 μm≦Ryni≦1.0 μm, and an Sk value is −1.6 or less.

The invention relates to a driving shaft assembly of a screw drilling tool capable of maintaining the pressure balance of an oil seal chamber for oil and gas drilling. The technical solution is: oil seal chamber pressure balance screw drilling tool transmission shaft assembly includes upper seal assembly, middle seal assembly and lower seal assembly, etc.; upper seal assembly and middle seal assembly, middle seal assembly and lower seal assembly The cavity between the sealing assemblies is filled with lubricating oil; the upper sealing assembly includes the annular cavity, the piston cylinder and the upper sealing check valve, etc., and the lower sealing device includes the flow channel, the piston chamber, the piston and the lower sealing check valve. Valves, etc.; the balance between the pressure in the sealing cavity and the external drilling fluid pressure is controlled by the up and down sliding of the piston cylinder and the piston, and the opening and closing of the upper sealing check valve and the lower sealing check valve. The invention has the advantages of good sealing performance, long service life, high temperature and high pressure resistance, small friction coefficient and simple structure, and can be used in gas drilling and mud medium drilling with high temperature and strong vibration.

A driving mechanism comprises: (i) an actuator comprising: an electro-mechanical conversion element; and a driving member which moves according to the elongation or contraction of the electro-mechanical conversion element; and (ii) a driven member frictionally engaged with the driving member, wherein the actuator which allows the driven member to move along the driving member, and the driving member is a graphite composite.

On the reciprocating bane of a reciprocating vane type rotary internal combustion engine (vane engine), big centrifugal force is generated by a high-speed rotation and is opposed to combustion pressure, and force equal to or more than seal action force to be necessary for vanes tip is added to the case inside, and friction loss becomes big. For get the force to support centrifugal force and to make this friction loss small, a vane tip cross-section vertical to a rotating axis is formed in a pick-shaped so as to generate gas bearing action force greatly. In addition, in order to raise a hydrostatic pressure in neighborhood of tangent line of both the outside curved surface of vanes tip and the case inside, and to get the multiplication effect that raise a hydrodynamic pressure in the vanes tip, gas supply hole is established parallel to the rotating axis in the midsection of the vanes tip. Therein, porous matrix or great many minute holes connect between the gas supply hole and outside curved surface of the vanes tip. High pressure air, combustion pressure gas or steam is provided to gas supply hole, then, it is spouting out from outside curved surface of it, and get a high hydrostatic pressure and raise a hydrodynamic pressure. Furthermore, because there is not the first steam for lubrication searing in a start, steam reservoir and pressurization pump is established. Therein, compress the air in the steam reservoir by press-fitting water in steam reservoir, then it is used to lubrication searing. After an engine began to move in start or activation, till pressure of revitalization vapor by exhaust becomes proper, as method to get the high pressure gas for lubrication searing, part of the combustion gas which is pulled out from the second steam supply-cum-combustion gas pulling out port, which established a little to the bottom dead point from the center point of the front side vane toward rotating, this vane which combustion chamber pressure of this engine, in which continued fuel injection and combustion (make the best use of characteristic of this engine), become maximum, is connected with the first steam supply pipe for lubrication searing through a filter and a check valve. Fuel injection in neighborhood of the top dead point is difficult to avoid the surface of a wall adhesion, because combustion chamber is so flat. As substitute for it, I devised a method to do vaporization of fuel or injection on the part which close late of air supply port near the bottom dead point, so as to vaporized or injected fuel mix with supply air without loss and so as not to join the air to pass without dropping in.

The invention provides a plunger used for a positive-displacement pump, which is formed by embedding metallic and non-metallic materials and has good wear-resisting property. The plunger comprises a plunger core body which is manufactured by Ni-Cr stainless steel and provided with a connecting end head; the plunger core body is coated with a shell prepared by a SIC material; a sealing adhesive layer is arranged between the connecting end head of the plunger core body and the contacting surface of the shell; the end head of the plunger core body is also provided with a plug to plug the end head. The surface of the plunger adopts a gas-phase permeation SIC shell with high hardness, and has very small friction coefficient and good wear-resisting property and good self-lubricity; after being used by the positive-displacement pump, the wear-resisting property of the plunger is higher than the metallic plunger by more than 5 times, thereby being applicable to be used by the positive-displacement pump with high reciprocating frequency and short stroke; simultaneously, the anti-corrosion property of gas-phase permeation SIC material also solves the anti-corrosion property of the plunger, thereby prolonging the service life of the plunger, guaranteeing that the plunger can operate normally in any serious environment and being applicable to be used in highly corrosive mediums.

In a waterproof connector, a mat seal and a rear grid are attached to a rear side of a connector housing. These mat seal and rear grid include terminal insertion openings and electric wire insertion openings, respectively, which communicate with terminal receiving chambers. Wire tubes are fitted to electric wires to which large female terminals are crimped, and are brought into elastically intimate contact with inner walls of large terminal insertion openings of the mat seal. Moreover, each of the wire tubes includes a protruding portion that protrudes rearward from the large terminal insertion opening of the mat seal and is located in the large electric wire insertion opening.

The invention provides a special nylon 66 composition for an automobile engine hood. The composition contains the following components by weight percent: 18-79% of nylon 66, 5-20% of copolymer nylon or long-chain nylon, 15-35% of alkali-free short glass fiber, 0-20% of mineral filler and 1.0-7% of auxiliaries, wherein the copolymer nylon is a polymer which is prepared through reaction, dehydration and polymerization of two or more monomer units, contains an amide group and is selected from one of or the mixture of more of a nylon6/66 copolymer, a nylon 6/12 copolymer and a nylon 6/10 copolymer; and the long-chain nylon is a polymer which is prepared through polymerization of monomers with carbon contents greater than or equal to 10 in polymer monomer units and other monomer units, contains an amide group and is selected from one of or the mixture of more of a nylon 11, a nylon 12 and a nylon 1010. The invention provides the special nylon 66 composition for the automobile engine hood and a preparation method thereof. The composition has the beneficial effects that the composition has quite high impact resistance and super strength and excellent chemical properties and dimensional stability; and products have smooth and clean surfaces and are cheap.

A valve which is cobalt-free excellent in wear resistance and seizure resistance manufactured by forming valve seats for a valve disc and a valve body with a nickel base alloy in which silicide particles or boride particles of small particle size are finely dispersed, and the valve seat is bonded to the valve disc or the valve body by way of an insert material comprising a nickel base alloy of a lower melting point by transient liquid phase diffusion bonding.

The invention discloses a solid wood floor which is characterized by comprising a single-layer solid wood board and a PVC (Polyvinyl Chloride) board, wherein the PVC board is fixedly connected with the solid wood board; the back of the solid wood board is formed into unit area blocks through uniformly spaced grooves; the solid wood board has the water content of 5-8% and the thickness of 8-20mm after being dried in vacuum at the temperature of 40-60 DEG C; the thickness of the PVC board is 2-5mm; and the depth of each groove is 1/5-1/2 that of the solid wood board. The solid wood floor is simple in structure, stable in size, non-deformable, warp-proof, dampproof, waterproof, environment friendly, capable of absorbing sound, preventing noise, conducting heat and preserving heat, suitable for floor heating, small in coefficient of thermal expansion, stable, simple and rapid in installation and construction and capable of being used after 24h if being adhered by using special environment friendly floor glue.