73 results about "Flash fire" patented technology

This invention relates to a blend of fibers for use in protective clothing, a lightweight fabric made from such blend, protective articles made from the blend or fabric, and methods for making the fabric. The protective fabrics and articles of this invention have the unique combination of being comfortable, being highly effective against electrical arcs and flash fire hazards and having a pleasing appearance. Specifically, these fabrics can be processed to give the look and feel similar to conventional clothing fabrics such as denim fabrics.

A yarn, fabric, and garment suitable for use in arc and flame protection and having improved flash fire protection contains a majority, by weight, of meta-aramid fibers having a degree of crystallinity of at least 20%, and a minority of modacrylic fibers, para-aramid fibers, and antistatic fibers. Garments made from the yarns provide thermal protection such that a wearer would experience less than a 65 percent predicted body burn when exposed to a flash fire exposure of 4 seconds per ASTM F1930, while maintaining a Category 2 arc rating per ASTM F1959 and NFPA 70E.

A yarn, fabric, and garment suitable for use in arc and flame protection and having improved flash fire protection consisting essentially of from (a) 50 to 80 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%, (b) 10 to 30 weight percent flame-retardant rayon fiber, (c) 10 to 20 weight percent modacrylic fiber, (d) 0 to 5 weight percent para-aramid fiber, and (e) 0 to 3 weight percent antistatic fiber based on the total weight of components (a), (b), (c), (d), and (e). In one embodiment, garments made from the yarn provide thermal protection such that a wearer would experience less than a 65 percent predicted body burn when exposed to a flash fire exposure of 4 seconds per ASTM F1930, while maintaining a Category 2 arc rating.

A yarn, fabric, and garment suitable for use in arc and flame protection comprising aramid fiber and modacrylic fiber wherein the modacrylic fiber has less than 1.5 percent antimony and is preferably antimony-free. In one embodiment, the yarn, fabric, and/or garments consist essentially of (a) 50 to 80 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%, (b) 10 to 40 weight percent modacrylic fiber that is antimony-free, (c) 5 to 20 weight percent para-aramid fiber, and (d) 1 to 3 weight percent antistatic fiber, based on the total weight of components (a), (b), (c) and (d). In some embodiments, garments made from the yarns provide thermal protection such that a wearer would experience less than a 65 percent predicted body burn when exposed to a flash fire exposure of 4 seconds per ASTM F1930, while maintaining a Category 2 arc rating per ASTM F1959 and NFPA 70E.

A yarn, fabric, and garment suitable for use in arc and flame protection and having improved flash fire protection, consisting essentially of (a) 50 to 60 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%; (b) 31 to 39 weight percent modacrylic fiber; and (c) 5 to 15 weight percent para-aramid fiber; said percentages on the basis of components (a), (b), and (c). In some embodiments, 1 to 3 weight percent of the meta-aramid fiber is replaced with an antistatic fiber comprising carbon or metal with the proviso that at least 50 weight percent meta-aramid fiber is maintained. Garments made from the yarns provide thermal protection such that a wearer would experience less than a 65 percent predicted body burn when exposed to a flash fire exposure of 4 seconds per ASTM F1930, while maintaining a Category 2 arc rating per ASTM F1959 and NFPA 70E.

In at least one embodiment of the present invention, a material intended for personal protective equipment is disclosed, wherein the material includes at least four different layers, the layers being: an outer first layer of a material comprising at least one polymer, which material is self-extinguishing; a second layer of a fiber material, which fiber material is self-extinguishing; a third layer being adhesive; and an inner fourth layer being a barrier laminate; wherein all at least four different layers individually are attached to layers located next to them. Furthermore, a protective suit including a material according to the present invention and the use of such a material for the production of personal protective equipment are also described. Moreover, a chemical and flash fire escape protective suit is disclosed, including a material according to the present invention, the suit meeting all of the basic requirements according to NFPA 1991, the suit having a minimum breakthrough time of at least 480 minutes for the chemicals according to NFPA 1991 when tested in accordance with EN 374-3 and ASTM F 739 with breakthrough criterion of 0.1 μg/cm²*min, the suit passing the permeation resistance test which lasts more than 180 minutes after flexing and abrasion according to NFPA 1991 and the suit passing the flame test according to ASTM F 1358 and the garment material flame test and the whole suit flash over test according to NFPA 1991 optional flash fire escape.

A low-temperature and high-voltage resistant aluminum electrolytic capacitor work electrolyte comprises by the mass percent: 45-75% of the main solvent, the 15-40% of the secondary solvent, 3-12% of the solute, 0.5-2% of the flash fire promotion additive, 0.2-1.5% of the gas absorption additive; the main solvent is one or more than one of the ethylene glycol, the propylene glycol, the glycerol, the polyethylene glycol 200 and the polyethylene glycol 400. The secondary solvent is one or more than one of the [Gamma]-butyrolactone, the dimethylformamide, the diglycolic simple methyl ether, the diethylene glycol monoethyl ether and the diethlyeneglycol monobutylether. The secondary solvent can be propylene carbonate and one or more than one of the [Gamma]-butyrolactone, the dimethylformamide, the diglycolic simple methyl ether, the diethylene glycol monoethyl ether and the diethlyeneglycol monobutylether. The low-temperature and high-voltage resistant aluminum electrolytic capacitor work electrolyte can resist the -55 DEG C and high voltage of 600V.

The invention discloses branched chain polybasic carboxylic acid ammonia salt mixture as well as the preparation method and the application thereof. The main component of the electrolyte prepared by the branched chain polybasic carboxylic acid ammonia salt mixture contains branched chain binary carboxylic acid ammonia salt and branched chain quarternary carboxylic acid ammonia salt, and also contains a small quantity of the branched chain ternary carboxylic acid ammonia salt, the carbon chain is more than nine carbon atoms in length, and is provided with one or a plurality of alkyl branched chain(s). The branched chain polybasic carboxylic acid ammonia salt mixture prepared by the invention has the advantages that the electric conductivity is high, the flash fire voltage is high, the voltage withstand capacity is high, the temperature resistant stability is high and the temperature scope is wide. Particularly, the branched chain quarternary carboxylic acid ammonia salt and the branched chain ternary carboxylic acid ammonia salt are contained in the polybasic carboxylic acid ammonia salt mixture, and the invention has higher electric conductivity and better application performance compared with the simple branched chain binary carboxylic acid ammonia salt.

An antifreeze constant temp gas water heater with a electric proportion valve for grading automatically, wherein the electric proportion valve is configured as a single-chip (25), a valve sheet (27), a gas valve core (4), a valve seat (28), a stepping motor (16), a photohead (12), a initialize switch (13), a water exit heat meter (1), a incoming flow heat meter (3), a hall water flowmeter (6) setting temperature value for providing proportional control data to the single-chip (25); implementing automatic switch between anti flash fire and fire row, gliding steadily linear scale gas supply, and the adjusting performance with little heat load is better than that of the constant-temperature water heater of the electromagnetic proportion valve greatly. The gas water heater effects with good usage, utility, energy-saving, water-saving are further increased because the product is low cost, advanced structure and remarkable effect. The gas water heaters without constant temperature regulating heat load in little range is placed gradually.

The invention discloses a method for preventing the short-circuit failure of a high-voltage aluminum-electrolyzing capacitor for a switching power supply, which comprises an optimizing step for an aging working procedure and a step for improving the flash-fire voltage of an electrolyte, wherein the optimizing step for the aging working procedure comprises the following substeps of: in the aging process of a product, aging by adopting a segmented voltage-raising mode, prolonging the aging time step by step after entering a high-voltage stage, and raising the highest aging voltage to be 1.5 times of the working voltage of the capacitor to improve the strength of continuously restoring a dielectric film by the electrolyte; and the step for improving the flash-fire voltage of the electrolyte comprises the following substeps of: adopting a non-water-system electrolyte to decrease the concentration of hydroxyl ions and reduce the generation of oxygen-ion discharge. By optimizing an aging process, the insulating performance of the dielectric film is improved, and the pressure-resisting characteristic of the product is improved; by optimizing electrolyte components, the flash-fire voltage of the electrolyte is improved, and flash-fire breakdown is prevented from occurring when the voltage is excessive; and by optimizing electrolytic paper, the short circuit of the product due to the breakage of the electrolytic paper is prevented.

The invention relates to an LNG and CNG automobile fire-resistant explosion-suppression system which comprises a gas extinguishing agent system, a signal acquisition and alarm system, and a control system, wherein the gas extinguishing agent system comprises a gas extinguishing agent storage bottle; an extinguishing agent container valve is mounted at the mouth of the gas extinguishing agent storage bottle and is connected with an extinguishing agent transmission pipeline with a pressure release valve thereon; a plurality of branch pipes are connected in parallel with the extinguishing agent transmission pipeline, and each branch pipe is connected with an electrodynamic selector valve and a spray nozzle in sequence; end parts of the branch pipes extend into an automobile cabin protected area. The system provided by the system has the advantages that prewarning and early inerting suppression are automatically conducted for LNG and CNG automobile fuel outleakage and fires, can give out prewarning in case methane concentration exceeds a pre-arranged value through real timely monitoring outleakage methane concentration and initial flash fire flame, can automatically open a gas suppression system in case the methane concentration of a sealed space exceeds 3 percent of a volume concentration or the flash fire flame appears, and therefore compensates a gap of the LNG and CNG automobile fire-resistant and explosion-proof devices.

The invention provides a nano surface treatment agent and a treatment method thereof covering surfaces of metal materials. The method comprises the following steps: 1) remove the oil and impurities from the surface of the material; 2) the nano-coated surface treatment agent to the surface to form a protective film by chemical bonding of the nano surface treatment agent to the surface of the material, wherein the nano surface nano treatment agent is a solution formed by mixing at least one alkoxide, water and an alkaline compound phase, and through a catalytic condensation reaction of alkoxide and water by the alkaline compound phase, the nano-surface treatment agent has a high flash fire point, and the surface treatment agent, and further, containing resins, additives and wax. The present invention will nanometer surface treatment agent chemically bonded to the surface of the material to increase the adhesion of a protective film on the surface of the material, and at the same time achieve the anti-corrosion and wear-resistant effect.

A flexible cut resistant hydrocarbon flash fire resistant latex glove article is provided, having a flame resistant cut resistant liner and a flame resistant oil resistant polychloroprene polymeric latex coating. The knitted cut resistant fire resistant liner has is made from a composite yarn having a fiberglass core and optionally including a steel fiber. The core has a cushioning core sheath formed by ring-spinning of microdenier staple cut resistant fibers of, for example, para-aramid, and Staple modacrylic fibers can be included with the staple para-aramid fibers. Two wraps of continuous yarns of polyester, para-aramid, or both at a wrap density such that the wraps do not cover the core sheath in its entirety. In the absence of steel fiber, the cut resistant hydrocarbon flash fire resistant glove exhibits good electrical insulation characteristics even with sweat generated from hand preventing short circuit of electrical circuits. The glove is flexible due to the low denier of thecomposite yarn and is highly breathable especially when only the palm and fingers are coated with polychloroprene polymer.

The invention discloses a working electrolyte for a wide-temperature high-pressure aluminum electrolytic capacitor, which comprises ethylene glycol, nano-scale SiO2, branched polybasic carboxylic acid ammonium mixture, organic straight-chain carboxylate, and high polymer, a stabilizer, a purifier and a dehydrogenation agent, wherein the weight percentage is 60-65: 10-16.5: 12-19: 12: 1-2: 0.5-0.8: 1-2. The invention further provides a preparation method of the working electrolyte for the wide-temperature high-pressure aluminum electrolytic capacitor. Compared with the prior art, the nano-scale SiO2 solution with high flash fire voltage and oxidation efficiency and mixed branched polybasic carboxylic acid ammonium are added in the working electrolyte for the aluminum electrolytic capacitor, so that at high temperature, the working electrolyte is good in thermal stability and corrosion resistant; the prepared novel electrolyte has the characteristics of low leakage current, large ripple current resistance, high frequency low impedance and long service life at high temperature.

The invention provides a microminiature rapid charging special-purpose aluminium electrolytic capacitor which comprises a shell, a core bag and a rubber plug. The core bag is sealed in the shell through the rubber plug. The core bag contains electrolyte which comprises a solvent, an inorganic acid ammonium salt, an organic acid ammonium salt, and a hydrogen elimination agent. The inorganic acid ammonium salt is ammonium borate or ammonium pentaborate or the mixture of the ammonium borate or the ammonium pentaborate. The organic acid ammonium salt comprises one or more of ammonium sebacate, ammonium azelate, diammonium phthalate, and dodecyl ammonium carboxylate. The hydrogen elimination agent comprises one or more of a p-Nitrobenzyl alcohol, a p nitroanisole and p-nitrobenzoic acid. The conductivity of the electrolyte in the invention is between 2.4 ms/cm to 2.8ms/cm, the ESR value of a product can be effectively reduced, thus the ripple resistance and lightning strike resistance ability of the product are improved greatly, the flash fire voltage is above 490V, in a condition of high voltage, the breakdown of electrolytic paper caused by flash fire of the electrolyte does not appears, and thus the voltageproof performance of the product is ensured.

The invention discloses a high-voltage aluminium electrolysis capacitor. The high-voltage aluminium electrolysis capacitor comprises a capacitor element, an electrolyte contained in the capacitor element, and an outer package which seals both the capacitor element and the electrolyte, wherein the capacitor element comprises an anode foil provided with an dielectric layer on the surface thereof, a cathode foil, and a diaphragm arranged between the anode foil and the cathode foil; the formation voltage of the anode foil is 950-1200vf; the electrolyte comprises the following components in percentage by weight: 63-75% of ethylene glycol or polyhydric alcohols, 4-15% of 24-50 carbon atom branched-chain binary or tricarboxylic acid ammonium salt, 1-10% of ammonium pentaborate, 1-12% of mannitol, and 0.2-1% of butyl phosphate; the conductivity of the electrolyte at 25 degrees centigrade is 0.1-0.4ms and the pH (potential of hydrogen) at 25 degrees centigrade is 5.8-7.8. As the formation voltage of the anode foil is 950-1200Vf and the electrolyte has very high flash fire voltage which can reach more than 700V, the capacitor has the working voltage of 700V, and the capacitor is effectively prevented from breakdown.

The invention provides an ultralow-temperature high-voltage chip aluminum capacitor-used electrolyte, which comprises 32% to 58% of a main solvent, 5% to 34% of an auxiliary solvent, 5.2% to 21.4% ofa solute, 2.5% to 8.5% of a flash fire booster, 0.7% to 2.5% of a hydrogen scavenger and 1% to 10% of a modified synthetic additive, wherein the main solvent is one or multiple selected from ethyleneglycol, diethylene glycol, triethylene glycol, ethylene carbonate, propylene carbonate, gamma-butyrolactone and the like; and the auxiliary solvent is one or multiple selected from diethylene glycol mono-methyl ether, diethyl carbitol, diethylene glycol ethyl methyl ether, diglycol dimethyl ether, triethylene glycol dimethyl ether, diethylene glycol monobutyl ether, dimethyl sulfoxide, sulfolane and the like. The ultralow-temperature high-voltage electrolyte has good negative temperature electric performance, higher stability and stronger applicability.

The invention discloses a method and a system for determining the open flash point by using a CCD mode. The method comprises: (1) acquiring an original image with no ignition and no flash fire; (2) heating the oil sample in a test oil cup; (3) acquiring real-time images during the heating process; (4) comparing the real-time images to the original image, and determining whether flash fire occurs; (5) repeatedly performing the steps (2)-(4) if the flash fire does not occur; and (6) recording the temperature of the oil sample as the flash point if the flash fire occurs. The system comprises a heating device, a CCD acquisition device, a temperature acquisition device, and a processor. According to the present invention, whether the flash fire occurs is automatically recognized by using the CCD technology, such that the labor force is liberated, the labor cost is saved, and the eyes of operators are protected; 2, the feature of the ignition head area image is eliminated, such that the blue light interference of the ignition flame can be effectively removed, and the accuracy of the determination result can be improved; and 3, with the firing pre-warning step, the setting of the too high preset temperature (exceeding the flash point) can be prevented.