34results about How to "Improve fire and explosion-proof performance" patented technology

The invention relates to a network power supply graded latch-selective power-off control system under a coal mine well, which has the comprehensive functions of lighting under the coal mine well, loading signals and supplying power, controlling power supply as well as protecting short circuit and leakage of electricity. The system is provided with two connecting line cavities, a power supply connecting line cavity and a load connecting line cavity; wherein, the two connecting line cavities are in independent flame proof type; by the control of open top locking devices of the connecting line cavities, a switch at the level does the tripping operation when a cover of the load connecting line cavity is opened, and load wire connecting terminals are uncharged; only when the cover of the load connecting line cavity is closed, the switch at the level is electrified; when a cover of the power supply connecting line cavity contrary to the instructions, a switch at the upstream does the tripping operation, the power supply is cut off, and terminals in the connecting line cavities are uncharged. An electric circuit of the system mainly consists of a main circuit, a control and protection circuit, a lighting short-circuit protection circuit, a signal short-circuit protection circuit and an earth-leakage protection circuit. The system has simple and reliable structure as well as low cost, and improves the fireproofing and explosion prevention properties of a single machine and a whole power supply system.

The invention discloses a plugging fireproof and explosion-proof structure of a valve side casing pipe of a converter transformer in a converter station. The problem that in the prior art, the mounting position of a converter transformer casing pipe is non-ideal in fireproof and explosion-proof performance, non-ideal in electromagnetic isolation effect and non-ideal in sealing performance. The plugging fireproof and explosion-proof structure comprises a fireproof and explosion-proof plate and a converter transformer casing pipe mounting hole, a converter transformer casing pipe is mounted in the converter transformer casing pipe mounting hole, and the space between the hole wall of the converter transformer casing pipe mounting hole and the outer pipe wall of the converter transformer casing pipe is filled with aluminum silicate needled felt layers; the fireproof and explosion-proof plate comprises a first metal face structure rock wool composite plate, a second metal face structure rock wool composite plate and a non-magnetic-conductive stainless steel impact resistant plate, and the aluminum silicate needled felt layers are located between the hole wall of the part, provided withthe converter transformer casing pipe mounting hole, of the first metal face structure rock wool composite plate and the second metal face structure rock wool composite plate and the outer wall of the converter transformer casing pipe. The plugging fireproof and explosion-proof structure is scientific and reasonable in design and convenient to use, and the mounting position of the converter transformer casing pipe is good in fireproof and explosion-proof performance, good in electromagnetic isolation effect and ideal in sealing performance.

The invention discloses a cable fireproof and explosion-proof blanket, and relates to the technical field of cable protection. The cable fireproof and explosion-proof blanket comprises a Kevlar fiberlayer, a flexible fireproof and explosion-proof inner layer and a plain weave fabric surface layer coated on the flexible fireproof and explosion-proof inner layer, wherein the plain weave fabric surface layer is formed by hot pressing a plurality of layers of ultrahigh molecular weight polyethylene fiber base cloth infiltrated with vinyl ester resin particles, the vinyl ester resin particles arediscretely arranged on the ultrahigh molecular weight polyethylene fiber base cloth at intervals of 1-2 mm, the flexible fireproof and explosion-proof inner layer comprises a flexible fireproof layer,a flexible heat insulation layer, an explosion-proof core layer, an arc-proof metal layer and an epoxy organic glass fiber reinforced plastic layer which are sequentially arranged in a matched mannerthrough mutually matched meshing parts, and a connecting structure is arranged outside the plain weave fabric surface layer. According to the fireproof and explosion-proof blanket for the cable, thecable is good in fireproof performance, flame retardance and explosion-proof performance.

The invention relates to an inert closed-pore perlite fire-insulation heat-insulation wallboard, the inert closed-pore perlite fire-insulation heat-insulation wallboard comprises a heat insulating block and a reinforcing layer disposed on the outer surface of the heat insulating block, wherein the heat insulating block is prepared by mixing raw materials of 50-70 parts by weight of closed-cell perlite, 15 to 25 parts by weight of silicate, 5 to 10 parts by weight of fiber, 5 to 15 parts by weight of fly ash, 3 to 8 parts by weight of volcanic ash, 15 to 20 parts by weight of a polyurea prepolymer, 5 to 6 parts by weight of polyurethane gel, 4 to 6 parts by weight of a flame retardant, 1 to 1.5 parts by weight of a diamine chain extender, 3 to 5 parts by weight of graphene and 5 to 8 partsby weight of a solvent, and the reinforcing layer is prepared by spraying after mixing raw materials of 3 to 4 parts by weight of the polyurea prepolymer, 1 to 1.3 parts by weight of the polyurethanegel, 1.6 to 2 parts by weight of the flame retardant, 0.3 to 0.5 part of the diamine chain extender, 1 to 1. 3 parts by weight of the graphene and 2.5 to 3.5 parts by weight of the solvent; wherein the shell of the closed-pore perlite is filled with an inert gas. The inert closed-pore perlite fire-insulation heat-insulation wallboard not only has the characteristics of light weight and heat preservation, but also has high structural strength and excellent flame retardant and antiknock performance.

The present invention relates to one kind of porous fiber modified cement-base concrete. Porous fiber material in certain amount is added into concrete or mortar via intensive mixing to form the concrete containing porous fiber. The concrete containing porous fiber as ideal building material has excellent fireproof and antiexplosion performance, anticracking performance, antiseepage performance, antifreezing performance, impact resistance and antiwear performance.

The invention discloses a novel all-weather electric vehicle battery pack shell which comprises an upper cover assembly and a lower box body assembly installed in a sealing and buckling mode through a U-shaped sealing strip. The upper cover assembly comprises an upper cover, an upper heat preservation layer and a sealing strip which are fixed through an upper bonding layer from outside to inside, the lower box body assembly comprises a cold and hot circulation aluminum pipe, an inner plate, a lower bonding layer and an outer plate which are fixed from inside to outside, and the periphery of the outer plate is provided with a lower heat preservation layer fixed through a closed cavity formed by bonding an L-shaped sheet metal part. And a U-shaped matched sealing strip is arranged at the edge joint of the upper cover assembly and the lower box body assembly. According to the electric vehicle battery pack shell made of the all-weather composite material, the composite material has better designability, the multi-layer hollow three-dimensional structure design is adopted, the mechanical property is met, and meanwhile the battery shell has better heat insulation, air tightness, insulativity and better fireproof and explosion-proof performance.

The invention discloses a multistage atomization method for an inhibitor. The multistage atomization method for the inhibitor comprises the following steps that an air compressor compresses air, and the compressed air is stored in an air storage tank; the compressed air in the air storage tank is purified through a purification assembly and then conveyed to the air inlet end of a first-stage atomizer, the inhibitor is conveyed to the liquid inlet end of the first-stage atomizer, and first-stage atomization is carried out on the inhibitor through the first-stage atomizer; and the inhibitor after first-stage atomization enters the liquid inlet end of a second-stage atomizer, the compressed air in the air storage tank is purified through the purification assembly and then conveyed to the airinlet end of the second-stage atomizer, and second-stage atomization is carried out on the inhibitor through the second-stage atomizer, and the inhibitor after second-stage atomization is sprayed intoa limited space from an outlet of the second-stage atomizer. According to the multistage atomization method for the inhibitor, second-stage atomization can be carried out on the inhibitor to achievea more sufficient atomization effect, coalescence of atomized liquid drops is effectively reduced, and the use efficiency of the oil-gas inhibitor is effectively improved.

The invention provides a waste gas adsorption treatment device comprising a first adsorption box, a second adsorption box, a communication pipe for communicating the first adsorption box and the second adsorption box, a first-level flame retardant adsorber and a second-level flame retardant adsorber; the second adsorption box is stacked on the first adsorption box; the first adsorption box comprises a first ventilation opening and a first desorption port which are formed in the side wall; the second adsorption box comprises a second ventilation opening and a second desorption port which are formed in the side wall; the first-level flame retardant adsorber is arranged in the first adsorption box; the second-level flame retardant adsorber is arranged in the second adsorption box; the first ventilation opening, the first-level flame retardant adsorber, the communication pipe, the second-level flame retardant adsorber and the second ventilation opening successively communicate to form a ventilation duct. The invention also provides a treatment method based on the waste gas adsorption treatment device. Compared with the related technology, the waste gas adsorption treatment device saves space and can reduce harm of explosion accidents.

The present invention relates to a porous fiber-modified concrete for cement-based materials. The porous fiber material is added to concrete or mortar in a certain proportion, and a kind of concrete containing porous fiber is produced after fully stirring. The porous fiber concrete has good fire-proof and explosion-proof performance, crack-proof performance, anti-seepage performance, antifreeze performance, impact resistance performance and wear resistance performance, and is an ideal construction engineering material.

The invention provides a light shield with functions of bullet resistance, puncture resistance and explosion resistance, which consists of a shield body, an observation mirror, a handle and a protective layer, and is characterized in that the shield body is formed by performing high-temperature and high-pressure one-time compression molding on a high-strength polyethylene film bullet resistant material, the thickness of the shield body is 7.8mm, the upper surface of the shield body is provided with the observation mirror and the handle, the interior of the shield body is provided with the protective layer, the observation mirror is made of a high-strength PC board, is high in definition and is fixedly arranged on the shield body through a screw, and the handle is made of high-strength rubber and is fixedly arranged on the shield body through a screw. The light shield can be widely applied to the aspects, such as protective application of anti-terror maneuver, safety training and safety guard, and has the characteristics of excellent waterproof and explosion proof performance, light weight, high strength, flexibility in moving, water resistance, impact resistance, seismic resistance, trenchant edge puncture resistance, explosive impact resistance and the like.

The invention discloses a fire-fighting robot for closing a valve in case of fire. The fire-fighting robot for closing the valve in case of fire comprises an end effector, a wrist unit, an upper arm unit, an upper arm drive unit, a lower arm unit, a waist unit, a base, and high-temperature-resistant protection clothing, wherein the end effector is used for opening and closing the valve through clamping a handle of the valve and rotating around the center of the valve; the wrist unit is connected with the upper arm unit through a spline and a bolt; and the upper arm unit plays a role in transmitting the movement of the end effector and the wrist unit. According to the fire-fighting robot for closing the valve in case of fire provided by the invention, all components adopt mechanical drivingand have excellent fire-proof and explosion-proof performances; driving motors at the working part are placed behind the upper arm drive unit located under the indoor temperature state, so that the whole machine has a reliable performance; and when the fire happened, the robot can directly fulfil the task of closing the valve at short range, and people can operate at the safety position, so thatthe problem that the inflammable and explosive pipeline valve cannot be closed when the fire happened can be effectively solved.

The invention provides a fireproof explosion-proof water-based environment-friendly coating for an automobile engine compartment. The coating is prepared from the following components in parts by weight: 40 to 60 parts of water-based resin, 5 to 10 parts of phosphate anti-rust pigment, 4 to 6 parts of nanometer inorganic pigment, 0.1 to 0.5 part of a flatting agent, 0.1 to 0.5 part of a defoaming agent, 0.5 to 1.5 parts of a dispersing agent, 0.1 to 3 parts of an anti-settling agent and 15 to 30 parts of deionized water. The water-based acrylic resin and the water-based epoxy modified acrylic resin form a firm resin network structure, and then the sulfate anti-rust pigment and the nanometer inorganic filler are added, so the heat resistance, wear resistance and fire resistance of the coating are enhanced, and the coating can resist high temperature of 600 DEG C or above and has good fire and explosion resistance.

The invention belongs to the technical field of fire safety of oil storage tanks, and particularly relates to an inflatable oil-gas-free sealing structure of an external floating roof oil tank. According to the technical scheme, the inflatable oil-gas-free sealing structure of the external floating roof oil tank comprises an annular primary sealing structure and an annular secondary sealing structure which are connected to a floating disc, and the primary sealing structure and the secondary sealing structure are located between a tank wall and the floating disc; the secondary sealing structure is connected with an inflatable capsule, an embedded connecting nut is fixed in the inflatable capsule, the secondary sealing structure comprises a rain baffle, one end of the rain baffle is connected to the floating disc, and the embedded connecting nut is connected with the rain baffle through an inflatable capsule fixing piece. One end of the inflatable capsule fixing piece is connected with the embedded connecting nut, and the other end of the inflatable capsule fixing piece penetrates through hole sites of the rain baffle, a supporting limiting plate and an oil separation film and is fixed to the rain baffle, so that reliable connection is guaranteed. The invention provides the inflatable oil-gas-free sealing structure of the external floating roof oil tank.

The invention discloses an anti-explosion battery pack which comprises a battery pack body formed by a plurality of rows and a plurality of lines of cells, wherein a fireproof mat covers the top of the battery pack body, and is provided with a plurality of rows and a plurality of lines of fire exhausting gaps and a total fire exhausting hole, the fire exhausting gaps are positioned just above anodes of the cells, and the total fire exhausting hole is formed in the end part of one side of each row of the fire exhausting gaps. The anti-explosion battery pack is simple in structure, reasonable in design, and convenient to operate; the fireproof and anti-explosion performances are improved; after the fireproof mat is arranged, fire exhausted from the anodes of the cells are dredged, so that the fire is effectively prevented from spreading to the cells around, and the explosion probability of batteries is reduced.

The invention provides an exhaust gas adsorption treatment device. The exhaust gas adsorption treatment device includes a first adsorption box, a second adsorption box, a connecting pipe connecting the first adsorption box and the second adsorption box, a primary flame-retardant adsorber, and a secondary flame-retardant adsorber. The second adsorption box is stacked on the first adsorption box, the first adsorption box includes a first ventilation opening and a first desorption opening opened on its side wall, and the second adsorption box includes a The second ventilation port and the second desorption port of the wall, the first-stage flame-retardant adsorber is arranged in the first adsorption box, and the second-stage flame-retardant adsorber is arranged in the second adsorption box, so The first vent, the first-stage flame-retardant adsorber, the communication pipe, the second-stage flame-retardant adsorber, and the second vent are sequentially connected to form an air passage. The present invention also provides a treatment method based on the waste gas adsorption treatment device. Compared with related technologies, the exhaust gas adsorption treatment device of the present invention saves space and can reduce the hazards of explosion accidents.

The invention discloses an end effector of a fire-fighting robot used for fire valve closing. An input conic gear is engaged with an output conic gear, and the input conic gear and the output conic gear are connected with an input shaft and an output shaft through keys correspondingly. A gear is connected to the other end of the output shaft through a key. A lower clamp body and an upper clamp body are each in an L shape, and racks are machined on the upper portions of the lower clamp body and the upper clamp body to engaged with the left side and the right side of the gear correspondingly. Ahigh temperature resisting camera is in threaded connection to a connecting body. The end effector clamps a valve handle and rotates around the center of a valve so as to open and close the valve, theend effector is used in cooperation with the robot, can achieve stereoscopic dead-angle-free motion and is wide in applicability and suitable for ball valves, butterfly valves, stop valves and othercommon valves; the upper clamp body and the lower clamp body do opposite motion so that the clamping time can be shortened by one time; and the problem that inflammable and flammable pipeline valves cannot be closed when fires happen can be effectively solved.

The invention relates to a cable, a fireproof and explosion-proof blanket and application thereof. The fire-proof and explosion-proof blanket is provided with a blanket main body, and the blanket main body comprises an insulating layer, a basalt layer, an expandable graphite bag, an explosion-proof structure and an energy-absorbing material layer. The basalt fiber layer and the insulating layer are connected and define an interlayer cavity, the interlayer cavity comprises a fireproof cavity, an anti-explosion cavity and a buffering cavity which are sequentially arranged along the extending direction of the blanket main body, and the expandable graphite bag is filled in the fireproof cavity. The explosion-proof cavity is filled with the explosion-proof structure, and the explosion-proof structure comprises an arc-resistant layer, a hand-torn stainless steel layer and a Kevlar fiber layer which are sequentially arranged in a stacked manner; the arc-resistant layer is arranged at the side close to the insulating layer, the Kevlar fiber layer is arranged at the side close to the basalt fiber layer, and the buffer cavity is filled with the energy absorption material layer. Through the reasonable arrangement of a functional structure, the fireproof and explosion-proof blanket has excellent fireproof and explosion-proof performance, can be wound and wrapped at a high-voltage cable joint for protection, and is simple and convenient to use and operate.

The invention discloses a tunnel protective door system capable of fireproofing and anti-knock. The tunnel protective door system capable of fireproofing and anti-knock comprises a grotto side surfaceplate (1), a tunnel side surface plate (2) and a fire-resistant layer (3); steel trusses (5) are arranged between the grotto side surface plate (1) and the tunnel side surface plate (2) and are distributed in a longitudinal and horizontal staggered mode; the horizontal steel trusses and the longitudinal steel trusses (5) are respectively and fixedly connected with the grotto side surface plate (1) and the tunnel side surface plate (2), a plurality of filling space units are formed, all of the filling space units are respectively filled with fire-resistant materials, the fire-resistant layer (3) is formed between the grotto side surface plate (1) and the tunnel side surface plate (2), and thus a protective door system provided with a sandwich structure is formed. According to the tunnel protective door system capable of fireproofing and anti-knock, rigidity and intensity of the protective door is guaranteed through two layers of surface plates, good properties of heat insulation, fireresistant and anti-knock are provided through the fire-resistance layer materials, each filling space unit is individually filled with the fire-resistant materials through each filling hole respectively, and uniform stress of the whole is guaranteed.

The invention relates to a lithium battery battery box with automatic fire-extinguishing and explosion-proof function, which belongs to the field of fire-proof and explosion-proof lithium batteries, and solves the problem that the lithium battery ignites and explodes due to thermal runaway in the existing lithium battery technology; the solution includes a battery box shell and a lithium battery device and a trigger pump installed in the battery case, the lithium battery device includes a plurality of groups of lithium battery mechanisms, and the lithium battery mechanism includes a shell group, an upper trigger member arranged on the top of the shell group, and a lower trigger member arranged at the bottom of the shell group. The component, the lithium battery unit disposed inside the shell group, the upper trigger component is used to be triggered and communicated with the trigger pump when the temperature of the lithium battery unit reaches the preset temperature value. When the component is triggered and communicated with the trigger pump, water flows into the shell group through the upper trigger component to achieve fire and explosion protection for the lithium battery cell, and the lower trigger component is used to be triggered to drain out when the shell group is filled with water.

The invention discloses a fire-proof and explosion-proof structure for valve-side bushing plugging of a converter transformer in a converter station, which solves the problems of unsatisfactory fire-proof and explosion-proof performance, electromagnetic isolation effect, and sealing performance at the installation place of the converter transformer bushing in the prior art. The invention includes a fire-proof and explosion-proof plate and a rheometer bushing installation hole. The gap is filled with aluminum silicate needle-punched blanket; the fireproof and explosion-proof board includes the first metal surface structure rock wool composite board, the second metal surface structure rock wool composite board and non-magnetic stainless steel impact-resistant board, aluminum silicate needle-punched blanket layer It is located between the hole wall of the rheological bushing installation hole part of the first metal surface structure rock wool composite plate and the second metal surface structure rock wool composite plate and the outer wall of the rheological bushing. The invention has scientific and reasonable design, convenient use, good fireproof and explosion-proof performance at the installation place of the rheological bushing, good electromagnetic isolation effect and ideal sealing performance.

The invention discloses an assembly type fireproof and anti-explosion integrated structure of an extra-high voltage converter station valve side plugging system, and solves the technical problem that an existing converter station valve side plugging system is large in disassembly difficulty and low in efficiency during installation and maintenance, so that the installation and maintenance period is long, and the economic loss of a state grid is increased. The device comprises an upper fireproof anti-explosion module and a lower fireproof anti-explosion module; a sleeving through hole matched with the converter transformer sleeve is formed in the splicing position of the upper fireproof and anti-explosion module and the lower fireproof and anti-explosion module, and the converter transformer sleeve is arranged in the sleeving through hole in a sleeving mode and tightly sealed through a flexible ceramic silicone rubber material. The fireproof and anti-explosion performance of the converter station valve side sleeve plugging system can be effectively improved, fireproof and anti-explosion integration of the plugging system is achieved, the installation and disassembly construction efficiency of the plugging system in the converter transformer overhaul period can be effectively improved, the operation overhaul difficulty is reduced, the converter transformer maintenance or replacement period is shortened, and the maintenance cost is reduced. Therefore, the state grid economic loss caused by power failure is reduced.

The invention belongs to the technical field of tunnel dense cable fire prevention and explosion prevention, and particularly relates to a tunnel dense cable all-dimensional fire prevention and explosion prevention device which uses materials such as a fire prevention coating, a cable support, a refractory brick, a fireproof blanket, an inorganic density board, a rock wool board and a fire prevention board, and provides a tunnel dense cable all-dimensional fire prevention and explosion prevention device and a corresponding method. Therefore, the fireproof and explosion-proof capability of the dense cable is remarkably improved, and the use cost is reduced.

A preparation method for an explosion-proof cable trough, characterized in that: the explosion-proof cable trough is calculated by weight, using 100 parts of magnesium oxide, 60-65 parts of magnesium sulfate and 55-60 parts of water as reaction raw materials, and 0.8-60 parts of water 1.6 parts of citric acid monohydrate, 0.5-1 part of sodium citrate, 0.2-1 part of organic silicon and calcium stearate as modification additives, 5-10 parts of bentonite, 12-28 parts of fly ash, 18-28 parts Talc powder is used as filling material to prepare slurry, and then rolled together with low-alkali glass fiber gray cloth and non-woven fabric, cut into an inorganic non-metallic shell, and a metal layer is compounded on the inner wall of the formed shell. The explosion-proof cable trough box prepared by the present invention: (1) safe and environmentally friendly, the formaldehyde emission is as low as 0.1ml / L; (2) the mechanical strength is high, the flexural strength reaches more than 88.4MPa, and the bearing capacity can reach more than 13000KN; (3) Excellent physical and chemical properties; (4) Excellent fire-proof and explosion-proof performance, the fire-proof performance can reach A1 level, the fire-resistant limit can reach 4h, and it will not deform and decompose when it meets the flame temperature of 1500°C.

The invention provides fiber reinforced concrete. The fiber reinforced concrete comprises raw materials in a formula in percentage by weight as follows: 5%-15% of aggregate, 1%-5% of concrete, 1%-10%of steel fibers or carbon fibers, 5%-15% of an admixture, 3%-9% of polystyrene fibers, 2%-3% of cement, 1%-5% of sand, 11%-19% of stone, 5%-7% of fly ash, 3%-5% of water, 3%-5% of mineral powder, 3%-9% of polyacrylamide, 5%-18% of triisopropanolamine and 1%-6% of acrylic acid water reducing mother liquor. The fiber reinforced concrete prepared with a method has higher tensile strength, and fire-proof and explosion-proof properties are improved.

The invention provides a high-voltage cascaded isolation transformer with a solid insulation structure, and belongs to the technical field of isolation transformers. The high-voltage cascaded isolation transformer comprises at least one transformer module, the transformer module is provided with two cascaded sub-transformer units which are arranged in parallel, and each sub-transformer unit comprises: a high-voltage winding which is of a solid insulation structure; and a low-voltage winding, wherein the low-voltage winding and the high-voltage winding are coaxially arranged, and the low-voltage windings of the two sub-transformer units are connected in series. The high-voltage cascade isolation transformer with the solid insulation structure adopts an insulation material suitable for direct-current voltage, semiconductor shielding and main insulation staged pouring technologies are adopted, low partial discharge design and high insulation tolerance of the transformer can be achieved, acascade connection mode is adopted, a unit modular structure is formed, and application can be expanded according to different voltage classes. Power supply from the ground potential to tens of kilovolts or even hundreds of kilovolts or above can be achieved, and high-potential ground isolation is achieved.

The invention discloses a preparation method of an explosion-proof cable trough box. The method is characterized in that the method is characterized by comprising the following steps, the explosion-proof cable trough box is calculated according to the weight, 100 parts of magnesium oxide, 60-65 parts of magnesium sulfate and 55-60 parts of water are used as reaction raw materials, 0.8 to 1.6 partsof citric acid monohydrate, 0.5 to 1 part of sodium citrate, 0.2 to 1 part of organic silicon and calcium stearate are used as modification auxiliary agents, 5-10 parts of bentonite, 12-28 parts of coal ash and 18-28 parts of talcum powder are used as filling materials to prepare slurry, then the slurry, low-alkali glass fiber grey cloth and non-woven fabric are rolled and cut into an inorganic nonmetal shell, and a metal layer is compounded on the inner wall of the formed shell. The explosion-proof cable trough box prepared by the invention has the advantages that (1) the explosion-proof cable trough box is safe and environment-friendly, and the formaldehyde emission is as low as 0.1 ml / L, (2) the mechanical strength is high, the breaking strength reaches 88.4 MPa or above, and the bearing capacity can reach 13000KN or above, (3) excellent physical and chemical properties, and (4) excellent fireproof and explosion-proof performance is achieved, the fireproof performance reaches the A1 level, the fire endurance can reach 4 h, and deformation and decomposition do not occur at the flame temperature of 1500 DEG C.

A solvent for solution polymerization of vinyl acetate, comprising the following components: dimethyl carbonate, methanol. The use method is that the components dimethyl carbonate and methanol in the solvent used in the polymerization process of vinyl acetate are used separately and added to the reaction at different times. The present invention uses dimethyl carbonate and methanol as the polymerization solvent for the polymerization of vinyl acetate. Because the solvent is mainly dimethyl carbonate, the amount of methanol used is reduced, and the composition of toxic and harmful substances in the reaction process is reduced. The main dimethyl carbonate is non-toxic and harmless, the polymerization process is safe and easy to operate; it consumes less energy and is safe and environmentally friendly.

The invention discloses impact-resistant compressed carbon fiber polymer latex powder composite modified concrete. The impact-resistant compressed carbon fiber polymer latex powder composite modifiedconcrete comprises the following components in percentage by weight: 86.75%-88.85% of a concrete matrix material, 0.15%-0.25% of carbon fibers in a modified admixture and 11%-13% of polymer latex powder, the additives comprise 4.65 kg / m < 3 > of a water reducing agent, 1.16 kg / m < 3 > of a defoaming agent, 2.34 kg / m < 3 > of a coalescing agent and 1.56 kg / m < 3 > of a dispersing agent; wherein cement is Portland cement or ordinary Portland cement with the mark number of 42.5, and sand is medium river sand with the fineness modulus of 2.6-3.0; graded broken stone with the maximum particle sizenot larger than 20 mm is adopted as the stone; FDN efficient water reducing agent mother liquor is adopted as the water reducing agent; and the defoaming agent is a metallic soap common defoaming agent. According to the invention, the multiphase and multi-level characteristics of the concrete material are utilized; through optimized addition of the two admixtures of the carbon fiber and the latexpowder, the carbon fiber and the latex powder are well matched and bonded with the concrete, so that the concrete has high strength, high modulus and high toughness on the whole, the concrete is prevented from being broken, and the impact resistance and the fireproof and anti-knock properties of the concrete are obviously improved.