47results about How to "Physical stability" patented technology

The invention provides magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete is prepared from the following raw materials in parts by weight: 10-20 parts of phosphate, 30-50 parts of active magnesium oxide, 0.5-3 parts of a retarder, 5-15 parts of a mineral admixture, 0.5-4 parts of a functional additive, 20-30 parts of fine aggregate, 2-5 parts of reinforced fibers and 10-28 parts of water. The invention also provides a preparation method of the magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete provided by the invention has a multi-layer anti-corrosion barrier, a compact microstructure, an intelligent ion barrier and good environmental adaptability, and can meet the use requirements in complex and severe environments.

The invention discloses an industrial wastewater treatment process, and belongs to the technical field of wastewater treatment.The industrial wastewater treatment process comprises the following steps that firstly, the pH value of wastewater is adjusted to be smaller than 5, microelectrolysis filler is added, and pretreated wastewater is obtained through stirring, standing and filtering; 2, carrying out Fenton oxidation treatment on the pretreated wastewater; according to the method, an iron-carbon micro-electrolysis-Fenton oxidation combined mode is adopted for treating the wastewater, the COD removal rate is high, granular iron-carbon filler (micro-electrolysis filler) used in the iron-carbon micro-electrolysis process has stable physical and chemical properties, and the long-term and efficient treatment effect can be guaranteed; according to the micro-electrolysis filler, the boron-nitrogen-doped carbon material is used for replacing a conventional carbon material, so that the treatment efficiency of the granular iron-carbon filler is improved, the treatment process can be better linked with a Fenton oxidation treatment process, and industrial treatment is facilitated.

The invention belongs to the technical field of artificial board manufacturing, and particularly relates to a formaldehyde-free adhesive as well as a preparation method and application thereof, raw materials for preparing the formaldehyde-free adhesive comprise a flowable agent and a filling agent, and the formaldehyde-free adhesive is obtained by combining the raw materials through molecular acting force among the raw materials. The formaldehyde-free adhesive has the advantages of being high in bonding strength, stable in physical and chemical properties and not prone to deterioration, epoxy groups and carboxyl or anhydride groups in the formaldehyde-free adhesive can be directly reacted and coupled with groups on the surfaces of biomass fibers, the surface polarity of the formaldehyde-free adhesive after curing is large, the acting force between the formaldehyde-free adhesive and the biomass fibers is strong, and the formaldehyde-free adhesive is not prone to deterioration. The formaldehyde-free adhesive is high in strength after being cured; in addition, the formaldehyde-free adhesive subjected to complete curing reaction still has reversibility, the formaldehyde-free adhesive can be re-melted after being heated again, leftover materials generated by cutting in the later period of plate making can be subjected to hot pressing plate making without adding glue, secondary utilization of artificial plate waste is facilitated, resources are saved, and the environment is protected.

The invention relates to the field of functional polymer materials, and discloses a hydrogel polymer material containing active molecules, which comprises 4.5%-6.5% of polyvinyl alcohol, 85.5%-90.5% of deionized water, 7%-10% of p-phenylenediamine, 1%-3% of ammonium persulfate and 2%-5% of hydrochloric acid. The real-time monitoring and visualization of the polymerization process of the active molecules in the hydrogel are realized by utilizing the fluorescence effect and aggregation-induced effect of the active molecules, the understanding of the polymerization reaction mechanism is improved, the performance regulation and control range of the hydrogel material is expanded by regulating and controlling the polymerization reaction and accurately controlling the microstructure of the polymer, and in addition, the application prospect is wide. Active small molecules are orderly polymerized in a hydrogel confinement space to form a high polymer material with excellent performance, the poly-p-phenylenediamine hydrogel material has application prospects in multiple fields and shows good physical and chemical properties and biocompatibility, and the hydrogel prepared by adopting a freeze-thaw method is simple in process, suitable for large-scale production and suitable for industrial production. And the production cost is reduced.

The invention discloses traditional Chinese medicine granules as well as a preparation method and application thereof, and belongs to the technical field of preparation of traditional Chinese medicine granules. The traditional Chinese medicine granules are prepared from extracts of traditional Chinese medicine formula raw materials, a filling agent, a disintegrating agent, a sustained release agent and a flavoring agent, wherein the traditional Chinese medicine formula raw materials are prepared from radix rehmanniae preparata, fructus corni, radix cyathulae, rhizoma alismatis, poria cocos, roasted rhizoma atractylodis macrocephalae, obscured homalomena rhizome, radix clematidis, rhizoma corydalis and liquorice root. The traditional Chinese medicine formula granules with good treatment significance on cartilage repair are obtained, the traditional Chinese medicine formula granules are convenient to carry and store and have positive treatment significance on cartilage repair, the innovative process formula has a slow release effect, and compared with a water decoction, the medicine release time is prolonged, the administration frequency can be reduced, and the life quality of a patient can be improved.

The invention relates to the technical field of building coatings, in particular to an aerogel anti-condensation coating and a preparation method thereof, and particularly relates to an anti-condensation coating which is high in binding power, capable of being thinly coated and long in effect and a preparation method of the anti-condensation coating. Comprising the following components: 15-50 parts of aerogel, 10-20 parts of a binder, 0.2-1 part of a dispersant, 0.2-2 parts of a defoaming agent, 0.5-5 parts of a leveling agent, 10-50 parts of a silicone acrylic emulsion, 15-50 parts of a thermal insulation material, 2-16 parts of a coalescing agent and 10-30 parts of deionized water. The aerogel has stable physical and chemical properties, and the porous structure of the aerogel can continuously block the temperature and is not easy to form moisture condensation. Meanwhile, the components of the coating are reasonably matched, and all the components have a synergistic effect, so that the coating can keep a good anti-condensation effect in the long-term use process, the frequency of maintenance and re-brushing is reduced, a metal base material is protected from being easily rusted, and the cost and time are saved.

The utility model relates to the technical field of silicon powder heating, specifically relates to a heating device for powder purification of direct pulling method, including heating block, the lower part of heating block is provided with the footboard, the footboard is connected with heating block through the connecting device, the connecting device includes the connecting hole of setting at the top of footboard, the bottom of connecting hole is provided with the plug pipe, a plurality of expansion joints are provided on the pipe body of plug pipe, improve the fixed effect of connection, guarantee the safe use, prolong the life, reduce the production cost.

The invention discloses a high-water-solubility paclitaxel compound chemically modified by diaconitic acid molecules as well as a synthesis method and application of the paclitaxel compound chemically modified by the diaconitic acid molecules. The paclitaxel compound comprises paclitaxel and two aconitic acid molecules which are covalently bonded through ester bonds; the water-soluble paclitaxel compound is simple and convenient in preparation method and suitable for industrial production, paclitaxel drug molecules have amphiphilic properties, namely hydrophilicity and lipophilicity after being structurally modified by the method, the water solubility and the permeability are improved, the possibility of developing various oral and aerosol inhalation drug preparations is provided, and the compound is high in water solubility at normal temperature, low in cost and suitable for industrial production. According to the present invention, the prepared paclitaxel compound has characteristics of no foam generation during dissolution, more than 8 mg / ml, no need of any co-solvent, compound toxicity lower than the original drug paclitaxel, and ester bond accelerated hydrolysis fracture under the weak acid condition of the in vivo tumor tissue, such that the compound has advantages of certain tumor tissue targeting, good bioavailability and good anti-tumor effect.

The invention provides a method for preparing a ceramsite fracturing propping agent with a SiO2-Al2O3 mullite phase at a low temperature and a product. The method comprises the following steps: putting a mixture of SiO2, Al2O3 and an instantaneous sintering aid into a low-temperature sintering device; a pressure relief opening of the pressure shaft is in a closed state, the pressure shaft is used for conducting first pressurization treatment on the sintering chamber, the air pressure in the sintering chamber is controlled to be higher than the air pressure outside the sintering chamber, and a first pressurization treatment product is obtained; the pressure relief opening is in an open state, the air pressure inside the sintering chamber and the air pressure outside the sintering chamber are adjusted to be kept consistent, second pressurization treatment is conducted, and the mullite phase fracturing propping agent which is excellent in mechanical property, low in breakage rate, stable in physical and chemical property and resistant to chemical corrosion is obtained. The preparation method has the advantages of simplicity in synthesis, easiness in implementation, low sintering temperature and energy conservation, is beneficial to popularization in the field of industrial fracturing of petroleum and natural gas, and has a wide application prospect.

According to the present invention, there is provided a solid pharmaceutical composition formulation for nasal delivery of an opioid antagonist, comprising a pharmacologically effective amount of an opioid antagonist and a pharmaceutically acceptable carrier. The composition is preferably in the form of a powder produced by spray drying, which is then loaded into a disposable nasal applicator. Preferred pharmaceutically acceptable carriers in this regard include disaccharides (e.g., lactose or trehalose) and dextrins (e.g., cyclodextrin or maltodextrin), preferably spray dried in combination. The composition may further comprise an alkyl sugar, preferably a sucrose ester, such as sucrose monolaurate. The composition and applicator can be used to treat an opioid overdose in a subject.

The invention discloses high-density Sn < 2 + >-doped silicon-boron-gadolinium scintillation glass as well as a preparation method and application thereof, and belongs to the field of scintillation luminescent materials. The high-density Sn < 2 + > doped silicon-boron-gadolinium scintillation glass comprises a main body component, a reducing agent and externally doped Sn < 2 + >, the main body components comprise SiO2, B2O3, Gd2O3, GdF3 and X, and the X is one or more of Al2O3, AlF3, BaO and BaF2; the molar percentages of SiO2, B2O3, Gd2O3, GdF3 and X are as follows: the molar percentage of SiO2 is 5 to 10 mol percent, the molar percentage of B2O3 is 15 to 30 mol percent, the molar percentage of Gd2O3 is 25 to 35 mol percent, the molar percentage of GdF3 is 25 to 35 mol percent, and the molar percentage of X is 5 to 15 mol percent; the sum of the main components is 100 mol%; the molar percentage of the reducing agent is 0.5-2 mol%; the molar percentage of the externally doped Sn < 2 + > is 0.5-2 mol%; the density of the high-density Sn < 2 + > doped silicon-boron-gadolinium scintillation glass is 6-6.26 g / cm < 3 >, the photoluminescence quantum efficiency is 75%-90%, the density, the photoluminescence quantum efficiency and the X-ray imaging resolution of the scintillation glass are greatly improved, and the preparation cost of the high-density scintillation glass is reduced.

The application discloses a kind of post-treatment process of lubricating rust-proof steel wire, belong to steel wire surface treatment technical field, the post-treatment process includes the following steps: steel wire is immersed in the coating liquid with temperature 70-80 ℃ soaking, after taking out, it is first dried in 50-60 ℃ temperature, then room temperature natural air drying;The coating liquid includes according to weight parts: modified MoS2 particle 3-6 parts, methyl cellulose 0.5-1 part, zinc dihydrogen phosphate 1.5-3 parts, boric acid 0.5-1.5 parts, WPU-SS dispersion 3-5 parts, alkyl polyoxyethylene ether phosphate ester salt 5-10 parts, methyl hydroxyl stearate 2-4 parts and benzotriazole 0.3-0.8 part.The application in the paper solves the problem of insufficient lubricity and rust resistance of steel wire surface by using self-made coating liquid.Provides a firm protective barrier for steel wire.

The present invention belongs to the technical field of sapphire crystal growth, and specifically relates to a method for controlling impurities in sapphire crystal growth and a crucible for crystal growth. A method for controlling impurities in sapphire crystal growth, comprising the following steps: removing impurities from the crucible, spraying an aluminum oxide solution on the inner wall of a molybdenum crucible, placing the crucible in a crystal growth furnace, and starting to heat up and sinter after the furnace body is sealed and cool down; growing crystals, filling aluminum oxide raw material powder into the treated crucible, and starting to heat up and melt the raw material after the furnace body is sealed, and seeding and crystal growth are performed after the raw material is melted, and after the crystal growth is completed, the crystal is cooled and taken out. The present invention mainly utilizes the reaction design and control of aluminum oxide at different temperatures, and obtains a crucible for crystal growth through a crucible removal operation, so as to avoid the introduction of impurity elements in the new crucible into the sapphire crystal growth process, thereby controlling the impurities of the sapphire crystal growth and improving the quality and consistency of the crystal growth.

The invention relates to the technical field of elastic floor tile materials, in particular to an elastic floor tile material prepared based on silicone rubber modification and a preparation method of the elastic floor tile material. Maleic anhydride grafted polypropylene and ethylene propylene rubber serve as main raw materials to prepare an elastomer base material, and a compact cross-linked network structure can be formed in the material; the high-strength elastic base material can effectively resist the impact of external force; in the preparation process of the floor tile material, raw materials and processes which are harmless to human bodies are adopted, so that the floor tile material is soft and comfortable in surface touch feeling, does not cause irritation or harm to skin, and is particularly suitable for places needing to frequently contact with the human bodies; therefore, the elastic floor tile material prepared based on silicone rubber modification has excellent physical and mechanical properties, excellent weather resistance, environmental protection, safety, diversified application scenes and personalized customization capability.

The invention relates to a hot slag air quenching granulation waste heat recovery system which comprises an air quenching chamber, a material conveying assembly, a membrane cooler, a boiler assembly and a discharging assembly. A buffer pool and a nozzle are arranged in the air quenching chamber. A plurality of discharging holes are formed in the bottom wall of the buffer pool. And hot slag enters the air quenching chamber and then falls to the material conveying assembly through the discharging hole. The nozzle is located below the buffer pool and used for scattering the hot slag into coarse sand. And the material conveying assembly is used for conveying the coarse sand into the membrane type cooler. And the membrane cooler is used for cooling the coarse sand to generate high-temperature water and inputting the high-temperature water into the boiler assembly. The boiler assembly includes a steam generator. The steam generator is used for enabling high-temperature water in the steam generator to form saturated steam and saturated water under heating of the boiler body. And the saturated steam is discharged through the discharging assembly. And the saturated water flows back to the membrane cooler and exchanges heat with the coarse sand again to form high-temperature water. Waste of water resources and waste heat resources is reduced, two byproducts of finished sand and saturated steam are generated, and the economical efficiency is good.

The invention belongs to the field of lithium-sulfur secondary batteries, and relates to a high-performance lithium-sulfur battery, the high-performance lithium-sulfur battery comprises a sulfur-carbon positive electrode, a lithium negative electrode, an electrolyte and a diaphragm, the diaphragm comprises a base membrane and a functional coating coated on one or two surfaces of the base membrane, and the functional coating comprises molybdenum disulfide particles coated with metal molybdenum nanoparticles. The application of molybdenum disulfide particles coated with metal molybdenum nanoparticles to the functional layer of the lithium-sulfur battery diaphragm is proposed for the first time, so that the shuttle effect of polysulfide can be effectively inhibited, the redox reaction of the polysulfide can be accelerated, the polysulfide is promoted to be quickly converted into solid Li2S, the utilization rate of sulfur is increased, the accumulation of intermediate products is reduced, and the service life of the lithium-sulfur battery diaphragm is prolonged. The coulombic efficiency and the cycling stability of the battery are improved; and the two are combined to form an efficient conductive network, so that the conductivity is remarkably improved, rapid transmission of electrons in the conductive network is promoted, and the rate capability of the battery is improved.

The invention discloses a cutting fluid for a semiconductor material and a preparation method thereof, and relates to the technical field of cutting fluids. The semiconductor material provided by the invention is composed of the following raw materials: 0.001-30.00 parts of a water-soluble lubricant; 0.001 to 30.00 parts of an anti-wear lubricant; 0.001 to 20.00 parts of an extreme pressure lubricant; 0.001 to 50.00 parts of a special wetting agent; 0.001 to 30.00 parts of an emulsifying dispersant; 0.001 to 90.00 parts of an antirust agent; 0.001 to 90.00 parts of a corrosion inhibitor; 0.001 to 10.00 parts of a bactericide; 0.001 to 50.00 parts of a settling agent; and 0.001 to 99.00 parts of deionized water. The prepared cutting fluid for the semiconductor material has high permeability and high lubricity, the surface quality of slices is high, the warping degree is low, and the cutting efficiency and the yield are improved.

The utility model discloses a heat accumulating type incinerator with a high heat recovery function, and relates to the field of incinerators. The incinerator comprises a lower incinerator body, an upper incinerator body is arranged at the top of the lower incinerator body, and a cleaning mechanism is arranged on the upper portion of the interior of the upper incinerator body. Then the electromagnetic vibration machine drives the heat insulation plate to vibrate at high frequency, then an external high-pressure air pump can be started through a control table, high-pressure air is guided into a pneumatic pipeline in the mounting ring, and through the operation, the electromagnetic vibration machine generates high-frequency low-amplitude vibration, so that an ash deposition layer on the heating surface of the top of the incinerator cracks and is gradually loosened; therefore, the adhesive force between the accumulated dust and the heating surface can be destroyed, the accumulated dust on the heating surface can be directly impacted, the accumulated dust is promoted to fall off, and the purpose of rapidly removing the accumulated dust is achieved.

The invention relates to a magnesian dry vibrating material and a preparation method thereof. The magnesian dry vibrating material comprises the following components in parts by weight: fused magnesite with the particle size of 1-3mm, fused magnesite with the particle size of 0.088-1mm, fused magnesite with the particle size of less than or equal to 0.088 mm, water glass, bischofite hexahydrate, kaolin, alumina micro powder and silica micro powder. The preparation method comprises the following specific steps: sequentially adding the fused magnesite with the particle size of 1-3mm, the fused magnesite with the particle size of 0.088-1mm and the fused magnesite with the particle size of less than or equal to 0.088 mm into a stirrer according to the ratio, and stirring for 5-10mm; then adding the water glass, the clofite hexahydrate and the kaolin, and continuously stirring for 3-5 minutes; finally, adding the aluminum oxide micro powder and the silicon micro powder into a stirrer, and stirring for 8-15 minutes to finally obtain a mixed material; and carrying out vibration molding on the mixed material, then baking at 200-250 DEG C for 3-5 hours, and demolding. The environment-friendly binding agent water glass is adopted to replace phenolic resin, so that the bonding strength is guaranteed, and meanwhile, generation and release of harmful gas are reduced.

The invention relates to the technical field of ceramics, and discloses a method for producing a ceramic product with an anti-counterfeiting function by using a high-temperature-resistant upconversion material, the high-temperature-resistant upconversion material is added into an underglaze color material, and the addition amount is 3-5wt% of the total weight of the underglaze color material; drawing a pattern on a ceramic body by adopting the underglaze color material; applying transparent glaze; sintering at the temperature of 1100 to 1320 DEG C; or coating the slurry A on the surface of the ceramic body; locally covering the slurry B; sintering at the temperature of 690 to 820 DEG C; the slurry A comprises lead-free glass powder and a blender; the slurry B comprises a decorative pigment, a blender and a high-temperature-resistant upconversion material; the addition amount of the high-temperature-resistant upconversion material is 1-5wt% of the total weight of the slurry B; wherein the high-temperature-resistant up-conversion material is YSZ: x mol% of Er < 3 + > and y mol% of Yb < 3 + >; 0 < x < = 6, and 0 < y < = 20. The high-temperature-resistant up-conversion material disclosed by the invention still has efficient luminescence performance after being subjected to secondary high-temperature sintering, and has a wide application prospect in the technical field of ceramic tracing and authentic identification.

This invention discloses carbon-based silica composite materials, high-impact, low-VOC resin composite materials, their preparation methods, and applications. The carbon-based silica composite material of this invention is a carbon-based silica composite material with silica loaded on the surface of activated carbon fibers. After in-situ synthesis of silica on a carbon source matrix, the composite material is obtained through high-temperature carbonization. This invention utilizes carbon and silicon sources as raw materials to synthesize, in-situ, a mixture containing carbon source and SiO2 in a liquid-phase system. 2 The composite material was then subjected to hydrothermal carbonization to prepare a material containing SiO2. 2 The composite component is composed of activated carbon fiber. The carbon-based silica composite material prepared by this invention has a high specific surface area and excellent adsorption performance. When added to resin as a filler, it can significantly improve the VOC release of the material and at the same time improve the impact resistance of the resin material.

The utility model discloses a high-strength durable slag line brick for a steel ladle, which relates to the technical field of slag line bricks and comprises a slag line brick body, four corners of the outer wall of the slag line brick body are arc corners, and a plurality of radial reinforcing ribs uniformly extend to the periphery along the radial direction of the outer wall of a support rib to reach an anti-oxidation coating. According to the utility model, the metal ceramic honeycomb-shaped supporting framework is arranged in the chamfered square hole and is integrally sintered with the hole wall to construct a high-strength and high-stability three-dimensional bearing network structure, so that the compressive strength of the slag line brick is remarkably enhanced, the slag line brick can bear a harsh working environment, and the service life of the slag line brick is prolonged. According to the slag line brick provided by the invention, the radial reinforcing ribs are arranged on the surface of the slag line brick, and are matched with a dual-protection mechanism of the porous reinforcing body and the anti-oxidation coating, so that the permeation of slag is effectively blocked, all-directional protection is provided for the slag line brick, and in addition, the radial reinforcing ribs further disperse stress concentration, avoid structural damage caused by overlarge local stress and prolong the service life of the slag line brick. Therefore, the overall durability and reliability of the slag line brick are greatly improved.

The invention discloses a bisphenol A-based hexa-functional-group resin / glass fiber / diethylenetriamine composite material and a preparation method and application thereof, and belongs to the technical field of epoxy resin composites.The preparation method includes the steps that bisphenol A and formaldehyde are heated and stirred to be uniform, then epoxy chloropropane and a NaOH aqueous solution are added, the mixture is heated and stirred to be uniform, then methyl ethyl ketone is added, desalting is conducted, and the bisphenol A-based hexa-functional-group resin / glass fiber / diethylenetriamine composite material is obtained; the preparation method comprises the following steps: mixing bisphenol A-based hexa-functional-group resin and diethylenetriamine, distilling the resin to obtain bisphenol A-based hexa-functional-group resin, uniformly mixing the bisphenol A-based hexa-functional-group resin and diethylenetriamine, coating a plurality of glass fibers with the mixture, and performing high-temperature curing, pressing and cooling to obtain the bisphenol A-based hexa-functional-group resin / glass fiber / diethylenetriamine composite material. The bisphenol A-based hexa-functional-group resin is crosslinked with diethylenetriamine, so that the molecular chain of the epoxy resin is tighter, a stable crosslinked structure is formed, the curing efficiency is improved, and the product has higher hardness and glass transition temperature. The glass fiber is doped, so that the mechanical property of the epoxy resin is remarkably improved.

The invention provides a heat-resistant polyester material as well as a preparation method and application thereof in preparation of polyester tableware, and relates to the technical field of high polymer materials, the heat-resistant polyester material comprises the following components: a thermoplastic polymer, a flaky nucleating agent, polyethylene glycol, a compatilizer, a coupling agent, a dispersing agent, an antioxidant and an optional toner, the heat-resistant polyester material provided by the invention is non-toxic, harmless, free of melamine / formaldehyde release, free of plasticizer precipitation, recyclable and recyclable, and meanwhile, the polyester tableware provided by the invention has excellent barrier (oxygen barrier) performance besides good heat resistance and mechanical properties.

The invention relates to the technical field of environment detection, in particular to environment detection-based automatic preparation equipment for a soil sample to be detected, which comprises a preparation tank, a driving mechanism, a grinding mechanism and a screening mechanism, and four discharging pipes are fixedly mounted on one sides of the bottoms of the four spiral conveying assemblies correspondingly, and the driving mechanism is in transmission connection with the spiral conveying assemblies, the discharging pipes, the grinding mechanism, the screening mechanism and the grinding rollers. Through the water-cooling heat absorption effect of the water-cooling grinding table, heat generated when the grinding roller grinds a soil sample is absorbed in time; and meanwhile, the intermittent rotating assembly intermittently rotates by driving the rotating isolation frame, the water cooling cavity which absorbs heat and the water cooling cavity which does not absorb heat can be effectively replaced, the water cooling cavity under the grinding roller is kept in an efficient heat exchange state all the time, stable grinding temperature control is achieved, and volatilization of chemical substances and loss of samples are reduced.

The application discloses the technical field of high polymer synthesis and functional material modification, and relates to a preparation method of low-molecular-weight polyacrylamide. The method comprises the following steps: firstly, preparing a double-metal doped multi-level pore carbon nanotube-covalent organic framework composite modification material, and the preparation process comprises the following steps: surface functionalization of multi-walled carbon nanotubes, growth of a covalent organic framework layer, doping of double-metal ions, and subsequent reduction and calcination treatment; then, adding deionized water, acrylamide and the modification material into a three-necked flask, stirring under nitrogen to dissolve the acrylamide, preparing an oxidation-reduction initiator solution, and dropping the initiator solution into the system under the protection of nitrogen, and polymerization reaction is carried out in a constant-temperature water bath at 19-21 DEG C. After the polymerization is completed, the product system is washed, filtered, and finally, low-molecular-weight polyacrylamide is obtained by using a vacuum freeze-drying method. The polyacrylamide prepared by the method has low and controllable molecular weight, and has good solubility and salt resistance.

The invention relates to rock core packaging equipment and method.The packaging equipment comprises a first track, a second track, a film winding mechanism and a pushing mechanism, the first track and the second track are linearly arranged, and a winding interval is formed between the first track and the second track; the lifting mechanism is arranged below the winding interval and is configured to jack and lift one end, close to the first track, of the rock core by a preset angle by taking the end part on the second track as a rotating point after the thin film is wound on the rock core, and the pushing mechanism and the lifted rock core are collinear; the rotary moving mechanism is arranged on one side of the second track and is configured to move the rock core to be in butt joint with the pushing mechanism after the rock core pushed by the pushing mechanism is rotated by 180 degrees, and the rotary moving mechanism can be matched with the pushing mechanism to abut against the two ends of the rock core at the same time and move the rock core synchronously. Film packaging of the core body and packaging of the end covers at the two ends of the core are achieved, and the risk that the film is torn is avoided.

The utility model relates to the technical field of manned lifting platforms, and discloses a lifting manned platform with a protection mechanism, which comprises a frame body, manned plates are connected to four corners of the frame body in a sliding manner, a power mechanism for driving the manned plates to move is arranged at the top of the frame body, fixing rods are fixed to the four corners of the manned plates through bolts, and the fixing rods are connected with the protection mechanism through bolts. One side of each fixing rod is provided with a guardrail, at least one guardrail is rotationally connected with the corresponding fixing rod, and the other guardrails are fixed to the corresponding fixing rods. Due to the arrangement of the guardrails, in the upward moving process of the manned plate, a person can hold the guardrails with hands, so that the body is stable, and the person is prevented from falling off from the manned platform and being injured; and by arranging a limiting mechanism and rotating a clamping block, a positioning groove and a positioning block are separated from clamping connection, then the movable guardrail can be rotated, people can get on and off the manned plate conveniently, and the convenience of the device is improved.

According to the preparation method of the high-altitude water for icing wind tunnel simulation, tetrahydrofuran and matrix water are mixed according to the mass ratio of 0%-20%, and the low-icing-temperature high-altitude simulation water for icing wind tunnel simulation is obtained. The tetrahydrofuran is added to introduce a hydrogen bond acceptor into the deionized water, so that the purity of the deionized water is not influenced, the icing temperature of the water can be regulated in a wide range, the supercooled icing temperature effect of the high-altitude ultrapure water is achieved, and the prepared icing wind tunnel high-altitude simulation water has the advantages of stable physical form, no layering and the like, and has a wide application prospect. The preparation process has the characteristics of simplicity in operation, high practicability and the like. The problem that the supercooling state of high-altitude high-purity water cannot be simulated on the ground is solved, and a solution is provided for simulating high-altitude water in an ice wind tunnel and preparing supercooled ultrapure water on the ground.

The utility model discloses a wearable medical rehabilitation walking aid device, which relates to the technical field of medical rehabilitation equipment and comprises an auxiliary frame, rollers are rotatably mounted at four corners of the bottom end of the auxiliary frame, a backrest is fixedly mounted on the back of the auxiliary frame, and armrests are fixedly mounted on two sides of the top end of the auxiliary frame. A sliding frame is slidably mounted in the auxiliary frame, a triangular bandage is detachably mounted on the sliding frame, an adjusting assembly is mounted on one side of the auxiliary frame, and a driving assembly is mounted in the auxiliary frame. By arranging the auxiliary frame and the adjusting assembly, when a patient needs walking rehabilitation training, the height of the sliding frame can be adjusted through the adjusting assembly according to the height of the patient; the waist of the patient is fixedly supported by the triangular bandage and the sliding frame, so that the body of the patient is kept stable during walking training, and the patient can independently walk without being supported by other people during walking training.