39results about How to "Oxygen isolation" patented technology

The invention discloses a medical silica gel sealing ring material and a preparation method thereof, and relates to the field of silica gel materials. When the medical silica gel sealing ring material is prepared, mica powder, phytic acid, diglycidyl ether and allyl glycidyl ether are uniformly mixed and react to obtain modified mica powder; the preparation method comprises the following steps: reacting 4-(2-aminoethyl) phenylboronic acid with 3, 3 '-dihydroxy-[1, 1'-biphenyl]-4, 4 '-diformaldehyde to obtain a graft; the preparation method comprises the following steps: reacting vinyl silicone oil, thioglycerol and methacryloylethyl sulfobetaine to obtain modified silica gel; uniformly mixing the modified silica gel, the modified mica powder and the graft, and reacting to obtain the medical silica gel sealing ring material. The medical silica gel sealing ring material prepared by the invention has excellent flame-retardant, anti-aging, antifouling and mechanical properties.

This invention discloses a method for producing granules that reduces the loss of active ingredients, relating to the field of granule preparation technology. This method addresses the problem of active ingredient loss in traditional granule production due to high temperatures, oxidation, mechanical friction, and solvent residue. It employs a four-stage process—low-temperature pretreatment, inert gas-protected granulation, gradient drying, and nano-coating and end-capping—combined with the application of a specialized composite binder, significantly improving the retention rate of active ingredients. Experimental data shows that granules produced using this method have a higher retention rate of active ingredients than those produced by traditional methods, while also exhibiting high granule formation rate and dissolution rates that meet relevant standards. The process of this invention is highly stable and widely adaptable, and can be widely applied to granule production in the pharmaceutical, pesticide, food, and feed industries.

The invention discloses an anti-aging and anti-electromagnetic shielding cable and a preparation method thereof, and belongs to the field of high voltage and the technical field of materials, the anti-aging and anti-electromagnetic shielding cable structurally contains a polyurethane-polyethylene copolymer and a flame-retardant and anti-electromagnetic sheet composite carrier, contains a polyurethane chain segment which is connected with a polyethylene main chain through a covalent bond, has no interface separation risk, and has good anti-aging and anti-electromagnetic shielding effects. Polyethylene is resistant to acid, alkali and salt mist, a carbamate group in a polyurethane chain segment can capture free radicals generated by photooxidation and thermal oxidation of polyethylene, aging is delayed from the molecular level, and the flame-retardant anti-electromagnetic sheet composite carrier endows the cable with good aging resistance and anti-electromagnetic shielding characteristics; the lamellar structure of the sheet-shaped carrier can block heat transfer and combustible volatilization, and the lamellar structure and the sheet-shaped carrier synergistically improve the flame-retardant efficiency; the introduction of the flaky composite carrier not only endows functional characteristics, but also can be used as a rigid reinforcement phase, so that the wear resistance and the extrusion resistance of the cable are improved, and the loss of the cable in the dragging and construction processes is reduced.

This invention provides a low-density flame-retardant thermally conductive foam powder filler, composed of the following components in parts by weight: 200-300 parts of boron nitride (80-100 micrometers); 200-300 parts of hollow glass microspheres (50-70 micrometers); 200-300 parts of aluminum hydroxide (8-10 micrometers); 200-300 parts of aluminum hydroxide (1-2 micrometers); and 2-4 parts of coupling agent. Its advantages are: 1. Low density: By introducing low-density hollow glass microspheres, the overall density of the filler is effectively reduced, meeting lightweight design requirements. 2. High thermal conductivity: The compound boron nitride forms a highly efficient thermal conductivity network. 3. Excellent flame-retardant performance: The halogen-free flame retardant aluminum hydroxide works synergistically with the hollow glass microspheres. The hollow glass microspheres form a glassy barrier at high temperatures, isolating oxygen and heat, achieving excellent flame-retardant effects. 4. Good dispersibility and compatibility: By modifying the powder surface with silane coupling agent, a "molecular bridge" is formed between the inorganic powder and the organic polymer matrix, which significantly reduces agglomeration, lowers the interfacial thermal resistance, and significantly reduces the viscosity of the system.

This invention discloses a novel in-situ solid electrolyte and its preparation method, comprising: mixing precursor A and precursor B, and carrying out a hydrolysis-condensation reaction under the action of a catalyst to obtain a POSS-based curing agent with R1 and R2 groups; in an inert environment, sequentially mixing the POSS-based curing agent, a double lithium salt, an organic solvent, and an initiator to obtain a precursor liquid; injecting the precursor liquid into a battery casing and allowing it to stand and soak, so that the precursor solution can fully penetrate the electrode pores; heating the battery after liquid injection at 45-80°C for 4-24 hours to initiate the polymerization and cross-linking of the R2 groups to form a three-dimensional network, and the R1 groups undergo microscopic phase separation to repel the electrolyte phase, constructing ion transport channels in the POSS cross-linked network, while the POSS framework adsorbs and fixes anions, thus forming a solid electrolyte in situ; improving the rate performance of the battery and effectively eliminating the risk of lithium dendrite precipitation under low-temperature fast charging conditions.

The invention relates to the technical field of polymethyl methacrylate, and discloses a flame-retardant polymethyl methacrylate material and a preparation method thereof.The flame-retardant polymethyl methacrylate material is obtained by reacting polymethyl methacrylate, a hydroxyl-terminated flame retardant and p-toluenesulfonic acid. The linear polymethyl methacrylate is crosslinked into a three-dimensional network structure, so that the crosslinking degree between molecular chains is enhanced, the molecular chains are not easy to slip under stress, good structural stability is maintained, and the polymethyl methacrylate has high tensile strength and bending strength. The flame retardant contains piperazine rings and phosphate structures, forms an intumescent flame-retardant system, generates phosphoric acid substances, nitrogen and other gases during combustion, promotes dehydration of a matrix to form an intumescent carbon layer, isolates oxygen, prevents heat conduction, inhibits the combustion process, remarkably reduces the peak value of the heat release rate and the total heat release amount, and has excellent flame-retardant performance.

This invention discloses a heat- and impact-resistant protective conduit for MPP cables and its preparation method, relating to the field of polymer materials technology. The components, by weight, include: 20-22 parts of a toughening dispersion made from anhydrous ethanol and terminally epoxy-terminated hyperbranched polysiloxane; 33-35 parts of a boron-nitrogen co-doped carbon dot made from citric acid, boric acid, and urea, first compounded with phytic acid and piperazine, then compounded with modified zirconium phosphate prepared by hexadecyltrimethylammonium bromide intercalation, and then modified with silane coupling agent KH-560 to form a flame retardant synergist; 12-14 parts of polyolefin elastomer; 2-2.5 parts of magnesium aluminum hydrotalcite; 0.2-0.24 parts of antioxidant; 0.2-0.3 parts of calcium stearate; 0.2-0.3 parts of polyethylene wax; and 100-120 parts of polypropylene. The introduction of the flame retardant synergist and other raw materials in this invention effectively improves flame retardancy, aging resistance, impact resistance, low-temperature resistance, and heat resistance.

The invention provides a flame-retardant antistatic nylon fiber with a skin-core structure and a preparation method of the flame-retardant antistatic nylon fiber, and belongs to the technical field of nylon fibers. The flame-retardant antistatic nylon fiber comprises an antistatic nylon skin layer and a flame-retardant nylon core layer, the outer surface of the flame-retardant nylon core layer is coated with the antistatic nylon skin layer, the antistatic nylon skin layer comprises a nylon 6 matrix and an antistatic agent, and the antistatic agent is aniline modified zirconium phosphate; wherein the aniline modified zirconium phosphate is obtained by carrying out in-situ polymerization on aniline monomers between stripped zirconium phosphate layers. The flame-retardant antistatic nylon fiber is obtained through sheath-core composite melt spinning. According to the invention, the antistatic agent and the flame retardant are efficiently and stably introduced into the nylon matrix, and the synergistic effect of the antistatic agent and the flame retardant is realized, so that the fiber has better spinnability and mechanical property, and meanwhile, the long-term effect and durability of the function are ensured.

The invention discloses a stable-structure, fire-extinguishing and flame-retardant lightweight composite material plate which is characterized by comprising a protective surface layer, an energy-absorbing buffer layer and a fire-extinguishing and flame-retardant inner layer which are sequentially compounded from outside to inside, and all the layers are integrally formed into the plate through a continuous hot-pressing compounding process; the preparation method of the composite plate comprises the steps of raw material pretreatment, preparation of each layer of continuous blank, and integrated forming and post-treatment of the continuous plate. The composite material plate is applied to a new energy battery shell. The invention aims to solve the problems of single function and insufficient safety protection performance of the existing new energy battery shell, realize the functions of stable integrated structure, fire extinguishment, flame retardance and light weight, improve the comprehensive safety protection performance of the battery shell, simplify the production process and reduce the production cost.

The utility model discloses a durene closed feeding device, which relates to the technical field of feeding devices and comprises a feeding component consisting of a feeding bin, a top cover and a feeding hole, and a moisture-proof air pressure balance component. By arranging the moisture-proof air pressure balance assembly, oxygen and moisture can be effectively isolated while air pressure balance in the feeding bin is maintained, caking or deterioration of raw materials in the feeding bin is avoided, meanwhile, reverse blowing operation can be achieved on the filter through inert gas conveying, the long-time efficient filtering effect of the filter is kept, and meanwhile the service life of the filter is prolonged. The wind wheel blades are driven by inert gas to rotate, so that the scraping plates run circumferentially to scrape the inner wall of the bottom of the feeding bin, the situation that raw materials adhere to the inner wall of the bottom of the feeding bin to cause blanking blockage can be effectively avoided, and smooth and stable feeding is guaranteed.

The utility model discloses a storage device for guaranteeing essential oil quality, which comprises a tank body and a tank cover, an inner container for storing essential oil is arranged in the tank body, the top of the inner container is provided with an opening, a sealing cavity is formed between the inner container and the tank body, inert gas is filled in the sealing cavity, and the tank cover is provided with a silica gel sealing plug which is tightly matched with the opening of the inner container. A shading layer formed by multiple layers of composite materials is arranged on the outer wall of the tank body, and the shading layer comprises an aluminum foil layer located on the outer layer, a fiber reinforcement layer located on the middle layer and an EVA layer located on the inner layer. According to the essential oil storage device, the sealing structure is optimized, the anti-oxidation function is added, and the shading design is adopted, so that the stable quality of essential oil in the storage process can be ensured, and the problems that the existing essential oil storage device is poor in sealing performance, poor in shading effect, easy to oxidize and the like are effectively solved.

The utility model provides a kind of welding device, including mounting seat, and welding cavity is equipped in mounting seat;Mounting seat is equipped with first installation port and second installation port;Multiple first clamps are detachably embedded in first installation port, the shape of the first clamping hole of each first clamp is different, and first shape pipe can be inserted into welding cavity through first clamping hole;Multiple second clamps are detachably embedded in second installation port, the shape of the second clamping hole of each second clamp is different, and second shape pipe can be inserted into welding cavity through second clamping hole;Heating assembly;When a first clamp is embedded in first installation port and a second clamp is embedded in second installation port, first clamp, second clamp and mounting seat form welding cavity;Part of heat generated by heating assembly is transmitted to welding cavity through mounting seat, and part of heat is transmitted to first clamp and second clamp to heat first shape pipe and second shape pipe.The present welding device is suitable for brazing of pipe fittings with different shapes and sizes.

This invention discloses a battery pack structure, relating to the field of battery pack heat dissipation technology. It includes a lower temperature equalization unit and an upper dual-mode heat dissipation unit. The lower temperature equalization unit includes a housing containing battery cells filled with an insulating and thermally conductive immersion liquid, ensuring complete immersion of the cells for uniform temperature distribution. The upper dual-mode heat dissipation unit includes a dual-cavity heat dissipation aluminum cover sealed to the top of the housing. Its lower side is attached to the battery cell terminals and aluminum foil via an insulating and thermally conductive elastic pad, dissipating the most concentrated heat from the top via the shortest path. The dual-cavity heat dissipation aluminum cover integrates a liquid cooling channel and an air cooling channel located above it. This invention, through a thermodynamically optimized design of "bottom full immersion temperature equalization + top directional heat conduction," completely eliminates the temperature difference between the top and bottom of the battery cells. Combined with dual-mode switching of air cooling priority and liquid cooling backup, it significantly improves heat dissipation efficiency, battery cell temperature uniformity, safety, cycle life, and reduces energy consumption.

The utility model discloses a fireproof pre-branch cable with a metal sheath, which comprises a main cable and at least one branch cable, and a fireproof branch joint is arranged at the joint of the main cable and the branch cable. Each of the main cable and the branch cable comprises a conductor, a main insulating layer, a metal sheath layer, a fireproof layer and an outer sheath which are sequentially arranged from inside to outside; the fireproof branch joint comprises a metal sleeve sleeved outside a connecting part, so that the safety is improved, the sealing failure caused by thermal expansion and cold contraction of a traditional joint is avoided, and the fire resistance of the joint is ensured to be consistent with that of the cable body.

The utility model relates to the technical field of high-temperature calcination of powder, and discloses an indirect heating type high-temperature atmosphere shaft furnace, which comprises a feeding device, a heating device and a heating device, the pushing device is connected with the feeding device and used for pushing the materials to the material storage pipe body; the material storage pipe body is a vertical cylindrical container and is internally used for accommodating and conveying materials; the heating rods are distributed in the axial direction of the material storage pipe body and used for providing a high-temperature heat source. And the heating rods are axially distributed along the material storage pipe body, so that the heating efficiency is improved, the materials are uniformly and efficiently heated, and the energy utilization efficiency is remarkably improved. Due to the arrangement of heat preservation cotton and a heat insulation layer, heat loss is effectively reduced, the temperature in the furnace is more stable, and the calcination efficiency is further improved. Meanwhile, different temperature intervals can be formed in the furnace due to the design of the thermal insulation layer, so that the requirements of different materials on temperature are met, and the applicability of the equipment is enhanced.

The application discloses a kind of polypropylene flame-retardant plastic and its preparation method and application, it is related to high polymer material technical field.A kind of polypropylene flame-retardant plastic, by following mass parts of raw materials composition: polypropylene 70-80 parts, halogen-free flame retardant 15-25 parts, flame-retardant synergist 1-5 parts, toughening agent 5-15 parts, antioxidant 0.1-0.5 parts, lubricant 0.5-2 parts.The application adopts specific structure halogen-free flame retardant, collocates flame-retardant synergist, can form dense stable carbon layer on polypropylene matrix surface, effectively insulates heat and oxygen, inhibits combustible gas release, to significantly improve flame-retardant performance, reduce combustion spread speed, improve vertical combustion grade.

The invention discloses a high-thermal-conductivity carbon black composite material and a preparation method thereof, and relates to the technical field of polymer composites.The high-thermal-conductivity carbon black composite material is prepared from, by weight, 20-40 parts of modified thermal conductive filler, 40-60 parts of matrix resin, 5-10 parts of dynamic flexibilizer, 2-5 parts of weather-proof stabilizer, 0.5-2 parts of curing agent and 15-25 parts of solvent; wherein the modified heat-conducting filler has a three-dimensional hierarchical structure, and is composed of substrate carbon black, a two-dimensional nanosheet heat-conducting bridging layer grown on the surface of the substrate carbon black, and an organic functional grafting layer grafted on the surfaces of the two-dimensional nanosheet heat-conducting bridging layer and the substrate carbon black. The prepared high-thermal-conductivity carbon black composite material is good in mechanical property and high in thermal conductivity.

The utility model discloses a separation type facial mask bag which comprises a bag body, a liquid cavity and a facial mask cavity are arranged in the bag body, a first easy-to-uncover strip and a second easy-to-uncover strip are arranged on the two sides of the interior of the bag body between the liquid cavity and the facial mask cavity respectively, and the first easy-to-uncover strip and the second easy-to-uncover strip are attached in a separable mode through hot melt adhesive. The first easy-to-tear strip and the second easy-to-tear strip are provided with transverse embossments, and vertical embossments are arranged at the two ends of the transverse embossments and form locking edges. A clamping block is arranged on the top face of the first easy-to-tear strip, and a connecting groove matched with the clamping block is formed in the top face of the second easy-to-tear strip.

The invention relates to lycopene water dispersible powder and a preparation method thereof, and belongs to the technical field of food additives. The method comprises the following steps: esterifying octadecyl alcohol and food-grade phosphoric acid, and reacting with edible gelatin to prepare modified edible gelatin; then lycopene dry powder is dispersed in ethyl acetate, a compound emulsifier, modified edible gelatin and 1, 3-propylene glycol are added, and preliminary embedding is achieved through high-speed shearing and ultrasonic nanocrystallization treatment; and step-by-step vacuum drying, secondary embedding with an excipient, freezing, crushing and screening are carried out, such that the water dispersible powder with a particle size of 0.1-0.2 mm is prepared. Through the hydrophobic binding and charge repulsion effects of the modified gelatin and the synergistic process of ultrasonic nanocrystallization and double embedding, the technical problems that traditional lycopene is poor in water dispersibility, prone to layering, high in solvent residue and insufficient in stability are solved. The prepared product is suitable for healthy food systems such as water-based food, beverage and the like, and has the advantages of convenience in storage and transportation and high bioavailability.

This utility model provides a moisture-proof and breathable valve bag, relating to the field of valve bag technology. It includes a valve bag with a base fixedly installed at the bottom of its outer surface. Two support frames are fixedly installed on both sides of the outer surface of the base. Two bidirectional screws are rotatably installed at the other ends of the four support frames. Four connecting blocks are fixedly installed on the upper side of the outer surface of the bidirectional screws. The four connecting blocks are threaded onto the outer surface of the two bidirectional screws. Two sliding rods are slidably arranged at the bottom of the four connecting blocks. The two ends of the two sliding rods are fixedly installed on the outer surface between the four support frames. A knob is fixedly installed at one end of each of the two bidirectional screws. Because the connecting blocks are limited by the bottom sliding rods, the rotation of the bidirectional screws can drive the four connecting blocks to move. Since the four connecting blocks are fixedly installed at the four corners of the valve bag, moving the connecting blocks to the sides can tighten the top of the valve bag, thereby closing the valve bag's inlet and preventing the valve bag from collapsing.

The utility model discloses a kind of protective flame-retardant photovoltaic cables, including cable body, the cable body includes cable core and sheath protection layer, the cable core is arranged in the inside of sheath protection layer, the cable core includes wire core and functional layer, the wire core is provided with multiple and arranged in the inside of functional layer, the functional layer includes insulating shield, first flame-retardant layer, metal armor layer and second flame-retardant layer, the insulating shield, first flame-retardant layer, metal armor layer and second flame-retardant layer are sequentially arranged from inside to outside, the first flame-retardant layer is ceramic silicon rubber flame-retardant layer, the second flame-retardant layer is aluminum hydroxide and magnesium hydroxide composite flame-retardant layer. Its realized photovoltaic cable flame-retardant capacity, increased practicability, thereby solved the problem that traditional photovoltaic cable mostly does not have perfect flame-retardant structure, leading to its flame-retardant performance is insufficient, combustible under high temperature or fire condition, affect the stable use of photovoltaic cable.

The utility model relates to the technical field of engine cylinders, and discloses an aluminum profile for an engine cylinder, which is good in corrosion resistance effect and comprises an engine cylinder body, a zinc coating is sprayed on the outer surface of the engine cylinder body, and a polytetrafluoroethylene coating is sprayed on the outer surface of the zinc coating. By arranging the zinc coating, the polytetrafluoroethylene coating layer, the nano corrosion-resistant coating layer and the wear-resistant layer, the engine cylinder can be protected, the corrosion-resistant effect can be achieved by arranging the nano corrosion-resistant coating layer, the phenomenon that the aluminum profile is corroded due to environmental factors is avoided, and the aluminum profile has good corrosion resistance and corrosion resistance, and the service life of the engine cylinder is prolonged. The strength of the aluminum profile is improved, the service life of the engine cylinder is prolonged, the wear-resistant function is achieved through the arrangement of the wear-resistant layer, the protection capacity of the surface of the engine cylinder is improved, and the high temperature resistance of the engine cylinder can be improved through the arrangement of the polytetrafluoroethylene coating layer.

The utility model discloses a polypropylene flame-retardant air pipe convenient to install, particularly relates to the technical field of flame-retardant air pipes, and comprises a polypropylene air pipe, a flame-retardant layer is arranged in the polypropylene air pipe, a heat insulation layer is arranged in the flame-retardant layer, and an installation mechanism for installing the polypropylene air pipe is arranged outside the polypropylene air pipe. An assembling mechanism facilitating assembling of the multiple polypropylene air pipes is arranged on one side of each polypropylene air pipe and comprises two mounting frames arranged outside the polypropylene air pipes, supporting plates are arranged on the two sides of one mounting frame, and two inserting rods are fixedly arranged on the sides, close to each other, of the two supporting plates. The bottom end of the inserting rod penetrates through the flame-retardant layer and the heat insulation layer, and an inserting plate is arranged on one side of the polypropylene air pipe. By arranging the flame-retardant layer, the polypropylene air pipe can be prevented from burning, safety is improved, a plurality of polypropylene air pipes can be installed through the assembling mechanism, and practicability is improved.

This utility model relates to the field of alloy tool coating deposition technology, and in particular to an alloy tool coating deposition device, including a device shell, a high-pressure nitrogen chamber, a heating element, a high-pressure airflow nozzle, a rotating shaft, a tool clamping mechanism, an inner ring coating nozzle, and an outer ring coating nozzle. Through the synergistic effect of the sealed heat-insulating shell, high-pressure nitrogen, heating element, rotating shaft, and multi-layer coating nozzles, uniform and high-quality coating deposition is achieved. After the tool is fixed in the spirally arranged clamping mechanism, the device is first heated to a suitable temperature to ensure that the coating liquid is fully evaporated. The initial coating is formed by spraying from the inner ring nozzle. Subsequently, the outer ring nozzle, combined with high-pressure airflow, performs optimized deposition, so that the coating particles are uniformly attached, while removing excess droplets, improving coating density and surface quality. Finally, through low-speed rotation curing and controlled cooling, an alloy tool with strong adhesion and excellent wear resistance is obtained.

The invention discloses a method for in-situ generation of a boron nitride coating on the surface of a graphite crystallizer, and belongs to the technical field of ceramic coatings. The method comprises the following steps: S1, carrying out surface pretreatment on the surface of the graphite crystallizer; s2, the graphite crystallizer subjected to surface pretreatment is coated with precursor slurry and then sequentially subjected to drying, segmented high-temperature in-situ reaction and aftertreatment, and a boron nitride coating is generated on the surface of the graphite crystallizer in an in-situ mode; the precursor slurry is prepared from the following raw materials in parts by mass: 30-50 parts of a boron source, 20-40 parts of a nitriding agent, 5-15 parts of a binder, 2-8 parts of an auxiliary agent and 30-60 parts of a solvent. According to the method disclosed by the invention, by optimizing a precursor formula, designing a segmented high-temperature reaction process and performing post-treatment steps, tight combination of the BN coating and a graphite crystallizer matrix is realized, meanwhile, the density of the coating and the purity of an h-BN phase are improved, the oxidation resistance of the graphite crystallizer is remarkably improved, and the service life of the graphite crystallizer is remarkably prolonged.

The application provides a fire-retardant device and a vehicle. The fire-retardant device is connected with an explosion-proof valve of a battery module and comprises a fire-retardant container and a trigger container. The fire-retardant container stores fire-retardant gas and has an open end provided with a blocking film. The trigger container is located outside the battery module and comprises a first inlet connected with the explosion-proof valve, a second inlet connected with the open end, and a first exhaust port. The trigger container is provided with a trigger member. The trigger member is used to break the blocking film when the battery module is in thermal runaway. When the battery module is in thermal runaway, the thermal runaway gas in the battery module is introduced into the trigger container through the explosion-proof valve. The signal of the thermal runaway gas received by the trigger member in the trigger container causes the blocking film to break. After the blocking film breaks, the fire-retardant gas stored in the fire-retardant container is discharged into the trigger container. By mixing the fire-retardant gas and the thermal runaway gas, the phenomenon of fire spewing from the battery pack is avoided.

This invention discloses a fire-retardant cable sheath material and its preparation method, relating to the technical field of sheath materials. In preparing the fire-retardant cable sheath material, the present invention involves reacting boron nitride sequentially with sodium hydroxide, 1-amino-4-[2-(triethoxysilyl)ethyl]benzene, and salicylaldehyde to obtain modified boron nitride; reacting ethylene-vinyl acetate copolymer with maleic anhydride and 1-allyl-1,1,3,3-tetramethyldisiloxane to obtain pre-modified EVA; reacting the pre-modified EVA with 4-(3-aminopropyl)-2,6-di-tert-butylphenol to obtain modified EVA; and melting and mixing the modified EVA, modified boron nitride, bio-based composite flame retardant, and chloroplatinic acid, followed by pressing to obtain the fire-retardant cable sheath material. The resin-based fire-retardant cable sheath material prepared by this invention exhibits excellent flame retardancy, anti-aging properties, and mechanical properties.

This invention relates to the field of biological sample storage technology and discloses an automated ultra-low temperature micro-positive pressure device and system, comprising: an upper frame and a lower frame; the upper frame includes a micro-positive pressure chamber, a motion module, a PSA nitrogen generation module, and an upper frame base; the micro-positive pressure chamber is disposed on the upper frame base, the motion module is installed inside the micro-positive pressure chamber, and the PSA nitrogen generation module is connected to the micro-positive pressure chamber through a first flange interface; the motion module integrates a cover gripping assembly, a hand gripping assembly, and a pipette tip assembly; the cover gripping assembly is used to grip the cover plate of the chamber or the transport box; the hand gripping assembly is used to grip the sample tray; and the pipette tip assembly is used to aspirate cryopreservation tubes. This invention constructs a micro-positive pressure inert environment, automates sample storage and retrieval, precisely controls temperature, monitors and adjusts in real time, improves the reliability and convenience of ultra-low temperature storage, and ensures the long-term stable preservation of biological samples.

The present application relates to the technical field of adhesive, and discloses a kind of flame-retardant polyurethane hot melt adhesive and preparation process, the present application is added to dry polyol, tackifying resin in reaction kettle, after heating stirring, add diisocyanate in nitrogen atmosphere, stirring reaction, then add polystyrene flame retardant, catalyst, defoaming agent, antioxidant, obtain flame-retardant polyurethane hot melt adhesive.The polystyrene flame retardant contains phosphate, melamine ring and a large number of benzene ring structure, forms intumescent flame retardant, and has good flame-retardant effect.The compatibility and interfacial strength of polystyrene flame retardant and polyurethane hot melt adhesive are high, the influence of flame retardant on the mechanical properties of hot melt adhesive is reduced, and the flame retardant contains high-strength polystyrene molecular chain, which is beneficial to improve the mechanical strength of hot melt adhesive, so that the hot melt adhesive has good peel strength and tensile properties.