44results about How to "Reduce low temperature resistance" patented technology

2499. The invention provides a multilayer coextrusion heat shrinking film which comprises a surface layer, a sandwich layer and a heat-sealing layer. The surface layer and the heat-sealing layer are respectively bonded with the sandwich layer through a bonding layer; the sandwich layer comprises a mixture composed of 98Wt% of PVDC resin and 2Wt% of processing aid, wherein, the PVDC resin is a VDC-MA copolymer, the melting point is 150 DEG C, the density is 1.7g / cm<3>, and the processing aid is epoxidized soybean oil or other plasticizing agent systems. The proposal increases the shrinkage factor of the multilayer coextrusion heat shrinking film, and improves the barrier property; the multilayer coextrusion heat shrinking film has excellent heat sealing performance, and is widely applied to the vacuum shrink package.

The invention discloses a lithium ion battery and electrolyte thereof, the lithium ion battery electrolyte comprises a non-aqueous organic solvent, lithium salt and additives, wherein the additives include an additive A-ring phosphonitrile compound, an additive B lithium fluoride phosphate compound and additives C, and the additives C are selected from at least one of a silane phosphate ester compound, a silane phosphite ester compound and a silane borate compound. Compared with the prior art, a nickelic positive pole lithium ion battery using the lithium ion battery electrolyte has ideal circulation capacity retention ratio, storage capacity retention ratio and lower gas output under high temperature, has lower direct current internal resistance under low temperature and can improve the heat stability of the lithium ion battery remarkably.

The present invention provides a lithium ion battery and an electrolyte thereof. The electrolyte for the lithium ion battery includes a non-aqueous organic solvent, a lithium salt and additives, wherein the additives include additive A cyclophosphazene compound, additive B lithium fluorophosphate compound, and additive C selected from at least one of silane phosphate compound, silane phosphite compound and silane borate compound. Compared with conventional technologies, the nickel-rich positive electrode lithium ion battery using the electrolyte of the present invention has a desirable cyclic capacity retention rate, a desirable storage capacity retention rate and a low gas production at high temperature, and has a low DC internal resistance at low temperature, which can remarkably improve the thermal stability of lithium ion battery.

The invention relates to a modified polytrifluorochloroethylene and a molding process thereof. The modified polytrifluorochloroethylene is prepared from polytrifluorochloroethylene and a modifier, wherein the modifier is a mixture of more than one, in an arbitrary ratio, selected from the group consisting of p-polyphenylene, graphite, carbon fiber, glass fiber, ceramic powder, polybenzoate, pigment, molybdenum disulfide and aluminum powder. The molding process for the modified polytrifluorochloroethylene is to subject polytrifluorochloroethylene and the modifier to drying, mixing, molding and cooling. The invention has the following beneficial effects: after addition of the modifier, the prepared modified polytrifluorochloroethylene has improved hardness, dimensional stability, high temperature resistance, wear resistance, thermal conductivity and creep resistance and altered friction coefficient; meanwhile, cost of polytrifluorochloroethylene is reduced, and the application scope of the modified polytrifluorochloroethylene is widened.

A task is to provide a non-aqueous electrolytic solution exhibiting excellent cycle capacity maintaining ratio and excellent low-temperature resistance characteristics and a non-aqueous electrolyte secondary battery using the same. An object of the present invention is to provide a non-aqueous electrolytic solution which improves the cycle capacity maintaining ratio and low-temperature resistance characteristics, and a non-aqueous electrolyte secondary battery using the non-aqueous electrolytic solution. The present invention is a non-aqueous electrolytic solution comprising an electrolyte and a non-aqueous solvent dissolving therein the electrolyte, wherein the non-aqueous electrolytic solution contains a compound represented by formula (1) (wherein X represents an organic group containing a heteroatom, Y represents a sulfur atom, a phosphorus atom, or a carbon atom, n represents an integer of 1 or 2, m represents an integer of 2 to 4, 1 represents an integer of 1 or 2, and Z represents an organic group having 4 to 12 carbon atoms and optionally having a heteroatom), and a non-aqueous electrolyte secondary battery comprising the non-aqueous electrolytic solution.

The invention provides a thermal shrinkage bag for cheese package, comprising a surface layer, a core layer and a heat-sealing layer. The surface layer and the heat-sealing layer are respectively bonded with the core layer via binding layers, the core layer is a mixture of 98wt% of PVDC resin and 2wt% of processing assistant, the PVDC resin is a VDC-MA copolymer, the processing assistant is an epoxy soybean oil or other plasticizer systems; the surface layer contains resin a and resin b, the resin a is an ethylene-ALPHA-olefin copolymer or a mixture of multiple ethylene-ALPHA-olefin copolymers, the resin b is an EMAA, EAA, EVA, EBA or EEA copolymer; and the heat-sealing layer comprises resin c and resin d, the resin c is a copolymer of ethylene and propylene, butylenes, hexylene-1 or octylene-1, and the resin d is a mixture of one or more selected from LLDPE, POP, VLDPE, LMDPE and CEO. The technical proposal provided in the invention effectively solves the shrinkage ratio, barrier properties and other problems; has proper oxygen and carbon dioxide gas permeation ratio and excellent heat seal-ability; and is suitable for fresh-keeping shrink package of cheese.

The invention discloses a cold-injury-resistance gene of lycopersicon esculentum mill and an application. On the basis of virus induced gene silencing (VIGS) technology, the novel chilling-injury-resistance related gene SISLD of the lycopersicon esculentum mill is discovered, and the gene, through silencing, can result in obvious decrease in low temperature tolerance ability of a tomato plant. Based upon analysis on an amino acid sequence encoded by the gene, protein encoded by the gene is [delta]8-sphingomyelin dehydrogenase, which is related to lipid metabolism of neurolemma, and the enzyme (the [delta]8-sphingomyelin dehydrogenase) plays an important role in a reaction that a plant resists to low-temperature stress. According to the research, a nucleotide sequence and an amino acid sequence of the gene are provided; and meanwhile, the invention also relates the application of the gene in cold-resistance breeding of tomato. The SISLD gene, when applied to anti-freezing breeding of the tomato, can improve the adaptability of tomato's high-quality varieties, extend a planting range of the tomato's high-quality varieties and promote stable production and high-yield production of the tomato's high-quality varieties.

The invention discloses a fire-retarding and low-temperature resistant polypropylene material, a preparation method thereof and use thereof. The material consists of 50 to 75 weight parts of co-polypropylene, 15 to 25 weight parts of fire retardant, 10 to 25 weight parts of thermoplastic elastomer and 0.2 to 0.5 weight part of antioxygen. The preparation method comprises: mixing the components in a high-speed mixer; feeding the mixture in an double-screw extrude equipped with multistage heating zones; and uniformly dispersing, extruding to make grains, and obtaining the fire-retarding and low-temperature resistant polypropylene material. The fire resistance of polypropylene material reaches UL94-3.2mm V0, the polypropylene material can bear a temperature of -20DEG C, the tensile strength of the polypropylene material is over 18MPa, the tensile elongation of the polypropylene material is over 200 percent, and the bending strength of the polypropylene material is not less than 22MPa. The fire-retarding and low-temperature resistant polypropylene material can be used for making automobile safety cell, control wire twisted sleeve, various outdoor electric wire protective sleeves and the like.

The invention relates to a labyrinth seal piston for a G-M refrigerator in the technical field of mechanical pistons. The piston is positioned inside a cylinder of the refrigerator and driven by a motor to move inside the cylinder in a reciprocating way and has a cylindrical structure; the piston is integrally made of the same material as that of the cylinder of the refrigerator or a material of which the thermal shrinkage at a low temperature is lower than that of the material of the cylinder; the outer surface of the piston is provided with a plurality of seal grooves which are vertical to the axle center of a cylinder; and a polyfluortetraethylene wear-resistant coating is formed outside the entire piston. The sealing performance, running stability and reliability of the G-M refrigerator can be improved effectively and the service life can be prolonged effectively.

The invention discloses a corrosion-resistant environment-friendly PVC modified material. The material comprises the following raw materials in parts by weight; 50-70 parts of PVC resin, 20-40 parts of nitrile rubber, 10-15 parts of a filling agent, 2-6 parts of a heat stabilizer, 1-20 parts of a plasticizer, 20-40 parts of an elastic modifier, 2-4 parts of an antioxidant and 3-5 parts of a lubricant, wherein the PVC resin is ethylene-process PVC resin with a polymerization degree of 1000 to 1200 and a density of 1.35 to 1.45 g / cm<3>; the filling agent is one of calcium carbonate, argil, talcum powder, diatomite and silicon dioxide; the heat stabilizer is prepared from a main stabilizer, an auxiliary stabilizer and an auxiliary agent according to a weight ratio of (20-40): (4-8): 1; the plasticizer is a mixture composed of a non-migration plasticizer PN-1030 and epoxidized soybean oil according to a weight ratio of (13-16): 1; and the elastic modifier is expanded polystyrene with a glass transition temperature of 80-90 DEG C and a density of 1.04-1.06 g / cm<3>. The material has the characteristics of capability of preventing photolysis and thermal decomposition, good elasticity, high tensile strength, good plasticity, good low temperature resistance, environment friendliness and high oxidation and corrosion resistance, and materials of all the components are convenient to obtain.

The invention discloses a preparation method of a novel flotation collector. The preparation method comprises the steps that cotton oil fatty acid is taken as a raw material and then subjected to saponification treatment to obtain cotton oil fatty acid soap, citric acid, sodium silicate, sodium carbonate, sodium oleate and phenoxyacetic acid composite products are added, and composite fatty acid citrate-based carboxylic acid containing multi-element carboxyl is obtained and applied to phosphate ore flotation by serving as a phosphate ore collector. The synthetic agent has the characteristics of being good in water solubility, high in collecting capability, good in selectivity and good in low temperature resistance, has the advantages of being low in agent dosage and production cost compared with unmodified fatty acid, and has the important significance for reducing the flotation cost and improving the flotation efficiency.

The invention belongs to the field of rubber compositions and particularly relates to a rubber membrane. The rubber membrane is composed of blank cloth and rubber materials covering the two sides of the blank cloth, wherein the rubber material is composed of the following components in parts by weight: 30-55 parts of butadiene styrene rubber, 25-35 parts of ethylene propylene rubber, 5-10 parts of silicon dioxide and 1-3 parts of paraffin oil. The rubber composition has relatively low low-temperature-resisting performance under the conditions that good oil resistance and adhering force are kept. The rubber membrane obtained by the scheme has the adhering force which is not lower than 35Mpa at -50 DEG C, still has good elasticity and has no hardening phenomenon. A preparation method of the rubber membrane has a simple process and is convenient to implement.

The invention discloses a method for producing environment-friendly modified macromolecular asphalt resin for road raw materials and waterproof coiled materials. The method comprises the following steps: (1) mixing pretreated raw materials and additives in a tubular static mixer according to percentage; (2) putting mixed materials in a lined reactor, and stirring while heating; (3) sealing a feeding port of the reactor, vacuumizing until the pressure is -0.06 to 0.08MPa, increasing the stirring speed along with temperature rise, vacuumizing until the pressure is -0.09 to 0.1MPa, removing moisture when the temperature rises to 100 DEG C, stopping vacuumizing, and reacting for 4-5 hours at the reaction temperature of 180 DEG C and the reaction pressure of 0.03-0.04MPa; (4) sampling and assaying a product after the reaction materials become a paste dilute sticky substance, and discharging, thereby obtaining an asphalt resin product. The method has the advantages that the environmental protection pressure is relieved effectively, solid chemical wastes are effectively recycled, the waste is changed into the valuable, energy is saved, emissions are reduced, and the environment is protected.

The invention discloses a low-cost rapid wireless binding hot melt adhesive and a preparation method thereof, and relates to the technical field of hot melt adhesives, the hot melt adhesive comprisesthe following components by weight: 35-55% of an olefin polymer, 1-8% of EVA resin, 2-10% of a reinforced rubber chain segment polymer, 30-55% of tackifying resin, 0-10% of microcrystalline wax, 3-10%of Fischer-Tropsch wax, 1-5% of an antioxidant and 0-5% of a filler.The Brinell viscosity of the hot melt adhesive is 6800+ / -500 / 160 DEG C, the softening point is 125+ / -10 DEG C, and the curing timeis 2.5-4s. The hot melt adhesive is suitable for automatic production of various books and magazines, and has the advantages of short curing time, excellent bonding performance, low hot melt odor, good temperature resistance, low production cost, simple preparation method, stable physical and chemical properties and suitability for roll coating and sizing modes. The adhesive has an excellent bonding effect on offset paper, coated paper, film-coated paper and the like.

The invention discloses a self-insulation hollow block brick for a wall and a preparation method thereof. The self-insulation hollow block brick for the wall comprises a block brick body, wherein three or more than three rows of elongated through holes penetrating through the block brick body in the thickness direction are formed in the block brick body; two side surfaces in the length direction of the block brick are smooth surfaces; two side surfaces in the width direction of the block brick are provided with through grooves penetrating the block brick body in the thickness direction; the length of the block brick is 355-365 mm, the width of the block brick is 235-245 mm, and the thickness of the block brick is 235-245 mm. The self-insulation hollow block brick for the wall is low in heat conductivity coefficient, good in low temperature resistance, high in compressive strength and light in weight; the insulation effects of a common brick and a block are integrated, the effects of insulating heat and saving energy by 65-70 percent can be achieved, and the process of manufacturing an insulation layer outside the wall is eliminated; moreover, raw materials are easily obtained, corrosion and pollution are avoided, the safety is high, component materials can be recycled, the binding power is high, the cost is low, and the self-insulation hollow block brick for the wall has the performances such as static resistance and incombustibility.

The invention discloses an automobile coating and a preparation method thereof, and belongs to the technical field of coatings. The coating comprises a main agent and a curing agent, and the main agent comprises polyaspartic acid resin, nanometer titanium dioxide, waterborne polyurethane resin, methacrylic acid, polyoxyethylene oleate, water, titanium dioxide, an anti-settling agent, a dispersant,a leveling agent, an antifoaming agent, a wetting agent, triethylamine and ethylene glycol butyl ether; and the curing agent comprises isocyanate resin and a catalyst. The coating is prepared by thefollowing steps: preparation of the aqueous polyurethane resin, preparation of the main agent, and mixing. A reinforcing system formed by the nanometer titanium dioxide, waterborne polyurethane resin,methacrylic acid and polyoxyethylene oleate is used in the automobile coating to improve the tensile strength, the elongation at break and the low temperature resistance of the automobile coating, reduce the fineness of the coating and improve the stability of the coating.

The invention discloses a preparation process of a biodegradable resin-based composite material, and particularly relates to the field of resin-based composite materials. The preparation process specifically comprises the following steps: step 1, adding 100-200 parts of epoxy resin, 150-200 parts of phenolic resin and 100-120 parts of organic silicon resin into a stirring smelting furnace, heatingthe stirring smelting furnace to 300-400 DEG C, and stirring at the speed of 60-80 rpm, and stopping stirring after the substances are fully and uniformly mixed. The cyanate ester resin and the bismaleimide are plasticized and molded so that the high temperature resistance can be greatly improved, the bending strength and the bending modulus of the matrix are also improved, the use effect is moredurable and not easy to wear, and the service life of the biodegradable resin-based composite material is greatly prolonged.

Provided is a 24KV vacuum high-voltage circuit breaker equipped with a small modular spring operating mechanism. The circuit breaker includes a box body. A solid-sealed polar pole and a VSH small modular spring operating mechanism are arranged inside the box body. A vacuum interrupter is arranged inside the solid-sealed polar pole. An insulated pull rod is arranged at the bottom of the vacuum interrupter. A transmission shaft in the VSH small modular spring operating mechanism is connected with the insulated pull rod through a connecting rod and crank arm structure so the VSH small modular spring operating mechanism can drive the insulated pull rod and the vacuum interrupter to realize closing and opening. The VSH small modular spring operating mechanism is applied to the 24KV vacuum high-voltage circuit breaker. The spring operating mechanism and the vacuum interrupter are arranged up and down, which is different from the plane layout mode in the prior art in which the spring operating mechanism is scattered. Compared with the original mechanism, the size is reduced by 60%, the number of parts is reduced by 50%, and the total weight is reduced by 30%. The 24KV vacuum high-voltage circuit breaker has the advantages of long service life, no need for maintenance, no pollution, no danger of explosion, low noise, and the like, and is more suitable for frequent operation and other harsh working conditions.

A coated graphite type negative electrode active material is provided which can reduce the low temperature resistance of a secondary battery. The coated graphite type negative electrode active material herein disclosed includes graphite, an amorphous carbon layer coating the graphite, and an intermediate layer situated between the graphite and the amorphous carbon layer. The intermediate layer is a carbon layer doped with boron. The amorphous carbon layer substantially does not include boron.

The invention provides a rubber combination, which is used for manufacturing rubber diaphragms. The combination comprises the following raw materials by weight percent: 25-47 percent of acrylonitrile butadiene rubber, 5-20 percent of second rubber selected from cis-butadiene rubber, butadiene styrene rubber, natural rubber and chloroprene rubber, 20-35 percent of low-temperature reinforcing agent, 1-3 percent of adhesive and the balance of other commonly-used additives. The rubber diaphragm prepared by the combination has the advantages that the oil resistance and the low temperature resistance are improved.

The invention discloses an oilproof sole material and a preparation method thereof. The oilproof sole material comprises APAO (amorphous poly-alpha-olefins) resin, APP resin, nitrile butadiene rubber,glass fiber, an inorganic filler, a thermal stabilizer, and a hindered amine photostabilizer; the above materials are weighed according to their parts by weight and are fed into a vacuum drying box for drying at 65-80 DEG C for 6-8 h; the dried materials are fed into a high-speed mixer and are premixed for 8 min; the mixture is subjected to melt extrusion at 150-230 DEG C through a twin-screw extruder and cooling granulation to obtain the sole material. A sole of a sports shoe made with the sole material has good oil resistance, cold resistance and wear resistance and is applicable to specialprotective shoes for personnel in the industries, such as chemical industry and food industry.

The invention provides a lithium ion battery electrolyte which comprises a surfactant and a film-forming additive, and the surfactant is perfluoroalkyl betaine; and the film-forming additive comprises vinylene carbonate. The problems of poor low-temperature performance and rapid charging of the lithium ion battery are solved, the surfactant is introduced to improve the infiltration performance of the electrolyte on a pole piece, the internal resistance of the battery is reduced, the electrode polarization of the battery in the charging and discharging process is reduced, the low-temperature discharge capacity retention rate is remarkably improved, and the cycle performance of rapid charging of the battery is improved.

The invention belongs to the technical field of lithium battery materials, and particularly discloses a lithium battery positive electrode material and a preparation method thereof. The lithium battery positive electrode material is prepared by adopting a reaction kettle with a carbon material three-dimensional grid. According to the lithium battery positive electrode material provided by the invention, a plurality of long-range orderly through and communicated pore channels are formed in the positive electrode material. The electrochemical performance of the battery at low temperature can be improved by directionally constructing a long-range ordered pore channel in the positive electrode material.

The invention discloses a preparation method of automobile paint, which belongs to the technical field of paint. The coating is composed of a main agent and a curing agent, and the main agent includes the following raw materials: polyaspartic resin, nano-titanium dioxide, water-based polyurethane resin, methacrylic acid, polyoxyethylene oleate, water, titanium dioxide, anti-settling agent , dispersant, leveling agent, defoamer, wetting agent, triethylamine, ethylene glycol butyl ether; the curing agent includes the following raw materials: isocyanate resin, catalyst. The invention is prepared through the steps of water-based polyurethane resin preparation, main agent preparation, mixing and the like. In the present invention, the reinforcing system composed of nano-titanium dioxide, water-based polyurethane resin, methacrylic acid, and polyoxyethylene oleate is used in the automotive coating of the present invention to improve the tensile strength, elongation at break, and low temperature resistance of the automotive coating. Sex, reduce paint fineness, improve paint stability.

The invention discloses ethylene propylene diene monomer rubber. The ethylene propylene diene monomer rubber comprises the following components in parts by weight: 15-25 parts of ethylene, 25-35 partsof propylene, 45-55 parts of a third monomer, 0.5-1.2 parts of a catalyst, 800-1000 parts of an organic solvent, 0.01-0.03 part of a terminator, 0.005-0.03 part of a stabilizer, and 5-8 parts of white oil. The glass-transition temperature of the obtained ethylene propylene diene monomer rubber is -50 DEG C or below, and excellent low-temperature performance is exhibited. The obtained rubber has high tensile strength and low hardness and exhibits good cold resistant performance.

Provided is a 24KV vacuum high-voltage circuit breaker equipped with a small modular spring operating mechanism. The circuit breaker includes a box body. A solid-sealed polar pole and a VSH small modular spring operating mechanism are arranged inside the box body. A vacuum interrupter is arranged inside the solid-sealed polar pole. An insulated pull rod is arranged at the bottom of the vacuum interrupter. A transmission shaft in the VSH small modular spring operating mechanism is connected with the insulated pull rod through a connecting rod and crank arm structure so the VSH small modular spring operating mechanism can drive the insulated pull rod and the vacuum interrupter to realize closing and opening. The VSH small modular spring operating mechanism is applied to the 24KV vacuum high-voltage circuit breaker. The spring operating mechanism and the vacuum interrupter are arranged up and down, which is different from the plane layout mode in the prior art in which the spring operating mechanism is scattered. Compared with the original mechanism, the size is reduced by 60%, the number of parts is reduced by 50%, and the total weight is reduced by 30%. The 24KV vacuum high-voltage circuit breaker has the advantages of long service life, no need for maintenance, no pollution, no danger of explosion, low noise, and the like, and is more suitable for frequent operation and other harsh working conditions.