82results about How to "Guaranteed low temperature resistance" patented technology

The invention relates to a thermostable viton gasket, which is mainly used as sealing element in plate exchanger using high temperature steam and heating oil. The viton gasket comprises 70-75 wt% of F26 ready-mixed glue and 25-30 wt% of HNBR ready-mixed glue. Said F26 ready-mixed glue comprises 100 wt% of 26-style rubber, 2-2.2 wt% of hexaflurate bisphenol A and so on. HNBR ready-mixed glue comprises 100 wt% of hydrogenated rubber, 48-52 wt% of black pigment and so on. The invention can resist high temperature steam and oil.

The invention provides an environment-friendly cold-resistant polyvinyl chloride (PVC) waterproof coil and a manufacturing technique thereof. The waterproof coil comprises the following components in parts by mass: 100 parts of PVC resin powder SG-5, 30-35 parts of synthetic plant ester, 2-4 parts of PVC heat stabilizer, 1-2 parts of calcium stearate, 1-2 parts of chlorinated paraffin wax and 30-40 parts of calcium carbonate. The synthetic plant ester, ethylene terpolymer or polyalcohol benzoate has the advantages of no toxicity and favorable low-temperature resistance, and thus, is used as a PVC plasticizer; and the environment-friendly heat stabilizer is added in the formula, thereby ensuring the environment-friendly performance and low-temperature resistance of the PVC waterproof coil. The coil adopts environment-friendly materials, does not have the problem of plasticizer volatilization, and prolongs the service life of the product (up to more than 15 years).

The invention relates to the field of optical auxiliary materials, in particular to a water-proof sealing grease for an optical instrument and a preparation method thereof. The grease, actually a mixture, is characterized by comprising the raw materials in part by weight ratio: two kinds of silicone oils with kinematic viscosities of 0.65-3000 cst and 3000-500000 cst at 25 DEG C, a lipid solubility additive, a plasticizer, and an inorganic gelling agent. The method comprises the following steps: adding the two kinds of silicone oils with kinematic viscosities of 0.65-3000 cst and 3000-500000 cst at 25 DEG C, the lipid solubility additive and the plasticizer in a mixing tank for mixing for 0.5-3 h at the speed of 30-1000 r/min, adding the inorganic gelling agent after the mixture is uniformly mixed for further uniformly mixing, pouring into a plate for spreading, placing in a vacuum drying box for heating 3-8 h, taking out for cooling to an ambient temperature, grinding 3-5 times, and packing if passing the detection. The grease is used for the sealing and lubricating of the optical instruments, has good water resistance, does not dissolve in the water environment, dose not disperse, is strong in air tightness, small in volatility and good in lubricity, has the advantages of no corrosion to metal and glass and has high and low temperature resistance.

The invention discloses a production method of a composite fiber cement board, and belongs to the technical field of building materials. The production method comprises the following steps: mixing microcrystalline cellulose with a sodium hydroxide solution, cooling the obtained solution, adding a precooled urea solution, stirring and mixing the obtained solution, centrifuging the obtained solutionto obtain a microcrystalline cellulose solution, dropwise adding an etherifying agent to the microcrystalline cellulose solution, performing constant-temperature stirring and reacting, cooling the obtained solution, adding urease and a calcium nitrate solution, continuing a reaction, concentrating the obtained reaction solution, drying the concentrated reaction solution to obtain etherified microcrystalline cellulose, performing a constant-temperature and constant-pressure reaction on the etherified microcrystalline cellulose and a sodium methoxide solution, cooling the obtained reaction solution, adding chloromethane, performing a constant-temperature and constant-pressure reaction, carrying out reduced pressure concentrating, drying the obtained concentrate to obtain modified microcrystalline cellulose, mixing cement, the modified microcrystalline cellulose, a water reducer and a defoamer, carrying out injection molding, and curing the molded mixture to obtain the composite fiber cement board. The composite fiber cement board obtained in the invention has excellent mechanical properties.

The invention relates to a hot-rolled high-strength oil pipe manufacturing method, which comprises the following steps: heating: heating a pipe blank in an annular furnace; punching: punching holes in the heated pipe blank through a puncher; annealing: annealing the pipe blank; spraying borax; removing oxide skin; hot-rolling: feeding the annealed pipe into a pipe mill for hot-rolling; separating the pipe: separating the rolled pipe from a core rod; removing stress and annealing: feeding the rolled pipe into the heating furnace for heating, so as to obtain the annealed pipe blank; pickling: removing rust scale on the surface; phosphating: forming a zinc phosphate chemically-generated covering membrane on the surface; saponifying: forming metal soap and lubrication covering membranes: cold-drawing: cold-drawing the pipe blank to be cold-drawn, so as to obtain a cold-drawn pipe; performing heat treatment: reducing residual stress; honing; and performing hot straightening treatment, so as to obtain a cold-drawn precise inner-hole honed pipe, wherein a numerically-controlled honing machine is adopted in honing. The cold-drawn precise inner hole-honed pipe obtained through the method is good in comprehensive performance, good in low-temperature impact toughness, precise in dimension, smooth in surface, and excellent oil storage property.

The invention discloses alloy for casting a space shuttle liquid hydrogen fuel tank. The alloy is prepared from the following raw materials in parts by weight: 85-90 parts of Al, 2.0-3.0 parts of Li, 2.0-3.0 parts of Cu, 0.1-0.25 parts of Zr and 0.1-0.2 parts of Sr. The alloy has the advantages as follows: with adoption of electron beams for smelting the alloy, harmful impurity elements such as O, N, S and the like can be greatly reduced in the alloy smelting process, purity and content of Al, Ni and Cu in the alloy are increased, low temperature resistance of the alloy is guaranteed, and as the temperature decreases, strength, ductility and toughness of the alloy are greatly improved; the aluminum ingot with the grade of Al99.85 is used as a raw material, purity of Al in the alloy is further improved; an ultra-low-temperature-resistant pressure-sensitive adhesive is solvent-free, the curing temperature is low, curing time is short, the ultra-low-temperature-resistant pressure-sensitive adhesive is used for bonding flexible foam plastic and a pipe rapidly, the on-site construction process is good, the ultra-low-temperature-resistant pressure-sensitive adhesive still realizes a better adhesion effect under the condition of ultra-low temperature; and transmission of low temperature can be better insulated by the soft foam plastic layer.

The invention discloses a high temperature-resistant anti-adhesion over-printing varnish, The over-printing varnish is prepared from the following components in parts by mass: 60-80 parts of styrene-acrylic acid copolymerized emulsion, 5-10 parts of waterborne self-crosslinking acrylic emulsion, 8-10 parts of waterborne wax emulsion, and 6-10 parts of solvent. Through using high temperature-resistant components of styrene-acrylic acid copolymerized emulsion, waterborne self-crosslinking acrylic emulsion and waterborne wax emulsion, a waterborne over-printing varnish, which can be dried under high temperature and has a high abrasion performance, can be obtained; meanwhile, as the varnish is waterborne over-printing varnish, therefore having environment-friendly characteristic.

The invention discloses a novel rubber seal ring for an explosion-proof motor, and belongs to the technical field of sealing rings. The rubber seal ring is characterized by comprising the following raw materials in parts by weight: 45-55 parts of neoprene, 10-20 parts of EPDM rubber, 4-6 parts of sulfidation system, 5-10 parts of a coldproof soften flux, 12-18 parts of a reinforcing agent, 5-10 parts of a coldproof assistant, and 2-5 parts of an ozone proof assistant. The rubber seal ring has the advantages that the rubber seal ring is high in ozone resistance, good in low temperature resistant performance, and reliable in sealing; the abrasion resistant capability is reinforced greatly; the product quality is more stable; the service life is prolonged by 200% to rubber seal rings for explosion-proof motors in the prior art.

The invention provides a road surface embedding device and method of a piezoelectric substrate. The road surface embedding device comprises a vehicle body, wherein a milling mechanism, a waste collection mechanism, a bonding layer spraying mechanism, a piezoelectric substrate mounting and embedding mechanism and an asphalt structure layer paving mechanism are mounted on the vehicle body in sequence from a vehicle head to a vehicle tail, wherein the milling mechanism can be used for milling a road surface to form an embedding groove; the waste collection mechanism is used for collecting wasteswhich are generated in a process of milling the road surface through the milling mechanism; the bonding layer spraying mechanism is used for spraying a bonding layer into the embedding groove; by adopting the piezoelectric substrate mounting and embedding mechanism, the piezoelectric substrate is conveyed into a hanging basket through the conveyor belt and is mounted in the embedding groove through the hanging basket; the asphalt structure layer paving mechanism is used for paving an asphalt structure layer and restoring a road surface. The road surface embedding device provided by the invention can realize more functions. The invention provides a novel engineering machinery product which is rare in a piezoelectric substrate embedding construction process, so that mechanical construction of piezoelectric substrate embedding of an existing road surface and a newly-built road surface can be realized.

The invention relates to a butadiene acrylonitrile rubber sheath formula. The formula comprises the following components: 100 parts of butadiene acrylonitrile rubber, 3 parts of polystyrene, 5 parts of ultralow density polyethylene, 6 parts of chlorinated paraffin, 6 parts of polyurethane, 2 parts of butyl acetate, 6 parts of calcined clay, 3 parts of talcum powder, 4 parts of ethylene glycol, 7 parts of phthalo blue, 3 parts of ethylene-vinyl acetate and 10 parts of dicyclopentadiene. The rubber sheath formula has the advantages of low cost, reasonable proportion, excellent performance, use stability and the like, improves the production benefits of factories and reduces the consumption of rubber, and the physical and mechanical properties of rubber sheaths are not reduced.

The invention provides a shielded cable, and relates to the field of power cables. The shielded cable comprises a plurality of insulation cable cores, a braid layer, a sheathing layer, a copper-plastic composite shield layer and a plurality of interval shield plates. The shielded cable provided by the embodiment of the present invention has excellent anti-interference performance. By use of the shielded cable, signal transmission is more stable and images transmitted are clearer.

The invention provides a foaming thermoplastic polyurethane elastomer which can solve the technical problems that the hardness, density, wear resistance, rebound rate and compression permanent deformation indicators of existing foaming thermoplastic polyurethane elastomers cannot meet requirements. The foaming thermoplastic polyurethane elastomer is characterized by being prepared from the following raw materials in parts by weight: 100 parts of a thermoplastic polyurethane elastomer, 3 to 10 parts of phenylene terephthamide fibers, 0.5 to 2.0 parts of polyimide, 1 to 3 parts of polytetrafluoroethylene fibers, 4 to 10 parts of ethylene-bis-stearamide and 0.3 to 2.5 parts of zinc borate. The foaming thermoplastic polyurethane elastomer disclosed by the invention improves the physical properties of the foaming thermoplastic polyurethane elastomer sneaker soles, and particularly shows that the density is further reduced, wear resistance is improved and rebound resilience is improved on the basis of maintaining relatively high hardness of the foaming thermoplastic polyurethane elastomer sneaker soles.

The present invention is constant temperature air exchanging machine and belongs to the field of air conditioning technology. The efficient heat exchange equipment comprising copper-aluminum finned pipes has small volume, light weight, no crossed infection, no maintenance, long service life and low power consumption, and may be combined with available central air conditioner system, ventilating system and refrigerating system to lower power consumption and provide sufficient fresh air. It has efficient heat exchanging copper-aluminum finned pipes as key part, and is one box structure with 2 independent channels and 4 ventilation ports. It has increased air exchange function on the basis of regulating air temperature and has lowered power consumption.