533 results about "Free water" patented technology

The invention provides a temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer for a soil-phase-free water-based drilling fluid as well as a preparation method and application of the temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer, and belongs to the technical field of drilling. The temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer for the soilless phase water-based drilling fluid comprises the following raw materials in parts by weight: N, N-dimethylformamide, a cross-linking agent and a cross-linking agent, the invention relates to a water-based adhesive which is prepared from the following components in parts by weight: 15 to 25 parts of N, N-dimethylacrylamide, 1 to 10 parts of 3-[(3-methacrylamidopropyl) dimethylammonium] propane-1-sulfonate, 1 to 10 parts of long-chain alkyl polyoxyethylene ether methacrylate, 0.005 to 0.015 part of macromolecular cross-linking agent, 0.03 to 0.08 part of initiator A and 80 to 100 parts of deionized water. The tackifying filtrate reducer can resist the temperature of 180 DEG C, can resist NaCl to be saturated, has excellent tackifying, shear-improving and filtrate-reducing effects under high-temperature and high-salt conditions, improves the rheological property and the filtrate-reducing property of drilling fluid, and ensures safe and efficient drilling of a deep well.

The invention discloses wet shotcrete for tunnel engineering as well as preparation and application methods thereof, and belongs to the technical field of wet shotcrete. The wet spraying concrete for tunnel engineering is characterized by being prepared from the following components in parts by weight: 410 to 440 parts of cement, 850 to 980 parts of medium sand, 780 to 860 parts of coarse aggregate, 195 to 215 parts of water, 35 to 45 parts of coated modified porous aggregate, 9 to 13 parts of water reducing agent and 12 to 25 parts of accelerator. The porous aggregate is subjected to coating modification treatment, so that in the preparation and production process of the wet-sprayed concrete for tunnel engineering, the state of the concrete is not influenced, but in the concrete spraying process, due to the fact that the porous aggregate subjected to coating modification and a film coated by the porous aggregate are damaged under the action of pumping and pumping pressure, the wet-sprayed concrete for tunnel engineering is not influenced. The porous aggregate is exposed, and the porous aggregate can adsorb free water in the concrete due to the characteristics of porosity and extremely easy water absorption of the porous aggregate, so that the concrete becomes viscous during spraying, and the rebound rate of the concrete is reduced.

The present invention discloses a fine-grained high-density concrete and its production process, which relates to the field of concrete technology. The concrete comprises solid granular material, cement, water, and nano anti-shrinkage additives; the unit volume of the solid granular material is 1m 3 The weight of each component is based on G A :G c :G js :G a； Among them, G A is the weight of solid particulate material per unit volume, G c is the weight G A The weight of cement filled in the void volume of solid particulate material, G js For the weight of external water, including G c The sum of the weight of water required for cement hydration and rheological properties of concrete before curing minus the weight G A The weight of water in the solid particulate material; G a The weight of the nano-anti-shrinkage additive added to the pore volume after cement hydration, minus the excess free water volume. Fine-aggregate, high-density concrete has a much lower porosity than ordinary concrete, significantly improving the concrete's compressive, flexural, and durability properties.

The invention belongs to the field of hydrogel preparation, and particularly relates to a preparation method of SA / CS / Ca < 2 + > dual-network hydrogel, an obtained product and application. The sodium alginate / chitosan / calcium ion (SA / CS / Ca < 2 + >) physical cross-linked double-network hydrogel is prepared through a semi-dissolution acidification sol-gel conversion method and an internal gel method, the hardness and chewiness of the hydrogel can be remarkably improved, and the elasticity and cohesiveness of the hydrogel can be improved; freeze-thaw stability research is carried out on the prepared SA / CS / Ca < 2 + > dual-network hydrogel, the influence of freezing temperature, thawing temperature, freezing and thawing cycle times and other conditions on properties such as gel structure, rheology, swelling rate, moisture distribution and the like is explored, and the result shows that when the freezing temperature is-80 DEG C and the thawing temperature is 4 DEG C, the gel subjected to one-time freezing and thawing cycle has good stability. Through detection and analysis, the hardness is relatively high, the elasticity and cohesiveness are also remarkably improved, the elastic modulus (G ') and the viscous modulus (G' ') of the gel are best, the swelling rate is relatively low, the free water content is relatively low, the bound water content is relatively high, and the gel structure is relatively stable.

The invention relates to the technical field of waterproof agents for fabrics, and particularly discloses a fluoride-free waterproof agent for fabrics and a preparation method of the fluoride-free waterproof agent. The preparation method specifically comprises the following steps: dehydrating polyol / ester, adding isocyanate, heating to 80-90 DEG C, reacting for 2-3 hours, cooling, dropwise adding a chain extender, reacting for 0.5-1 hour at 45-48 DEG C, adding POSS, stirring for 1-2 hours at 45-48 DEG C, adding an acrylic monomer A for blocking, cooling, dropwise adding acid, stirring and neutralizing to obtain a prepolymer; pouring the prepolymer into water, stirring and emulsifying to obtain a POSS-PU emulsion; quickly stirring the POSS-PU emulsion, an acrylic monomer B, an emulsifier, water, a co-emulsifier, a pH regulator and the like to obtain a composite emulsion; homogenizing the composite emulsion until the composite emulsion has obvious blue light; and adding dodecanethiol and an azo amidine initiator, reacting at 68-70 DEG C for 3-7 hours, cooling, filtering and taking out to obtain the fluoride-free waterproof agent.

The invention discloses a hierarchical optimization-based water supply network optimization transformation method. The method comprises the following steps of: finding out a node with the lowest free water head in a water supply network as a control point; finding a shortest distance path from the control point to the water plant as a main control path; searching a pipe diameter optimization scheme of the pipe section on the main control path by taking the condition that delta FNPV is greater than 0 as a target; if the control points change after the current optimized pipe diameter optimization scheme is executed, finding out all points lower than the free water heads of the original control points as candidate control points, finding out the shortest distance path from the candidate control points to the water plant as a candidate control path, and searching the pipe diameter optimization scheme of the pipe section on the candidate control path; and forming a combined transformation scheme together with the current optimized pipe diameter optimization scheme. On the basis of the pipe diameter optimization scheme of the replacement pipeline, a parallel pipeline optimization scheme is selected. And finally outputting a feasible pipe diameter optimization scheme list which comprises a replacement pipeline scheme and a parallel pipeline scheme. The method is high in efficiency, and the deficiency of human experience can be avoided.

The present invention provides a method for preparing a bio-based fluorine-free water repellent for synthetic leather, which includes the following steps: 1) reacting a bio-based polyol with a special isocyanate to obtain a multi-functional end-capped intermediate; 2) subjecting the multi-functional end-capped intermediate to an ester exchange to obtain an outwardly extending bio-based long carbon chain end to obtain a bio-based fluorine-free water repellent. The present invention also creatively proposes a bio-based fluorine-free water repellent for synthetic leather, which is prepared by any of the above methods. The present invention selects bio-based raw materials and effectively regulates the functionality in the reaction process in the structure, designs the outwardly extending water-repellent chain segments, and makes the water repellent have good performance. The water repellent prepared by the present invention is fluorine-free and easier to degrade, low-carbon and environmentally friendly, and conforms to the concepts of green chemical industry and renewable.

The invention relates to an automatic magnesium oxide coating analysis system and method, and belongs to the technical field of coating quality analysis. The method comprises the following steps: acquiring attributes of a magnesium oxide coating, an infrared spectrum and environment temperature and humidity data, and constructing a multi-source feature set; analyzing the distribution dispersion and local enrichment risk of free water based on a dynamic migration model, and analyzing the bonding weakening degree and dissociation risk of bound water based on a chemical stable state model; respectively generating free water treatment process parameters for inhibiting structural damage and combined water treatment process parameters for preventing performance degradation according to the abnormal analysis result and the coating attribute; by performing coupling influence analysis on the two types of process parameters, the balance requirements of the structural integrity and chemical stability of the coating are coordinated, an optimized process scheme is generated, and cooperative regulation is realized. According to the method, accurate identification, independent analysis and cooperative control of the free water and the bound water are realized, and the accuracy, reliability and quality consistency of coating water treatment are improved.

The invention discloses a seepage field adaptive analysis method and device based on a flexible polygon unit, and the method comprises the steps: dividing the polygon unit into a plurality of sub-regions, and constructing an internal water head field of each sub-region; recognizing a free water surface according to water head features extracted from the internal water head field of each sub-region; if the free water surface is recognized for the first time at present, or the error of the positions of the free water surfaces recognized by two adjacent rounds of iteration does not meet a preset condition, quadtree decomposition is carried out on the free water surface to obtain new sub-regions; returning to the step of extracting the water head features according to the internal water head field of each sub-region until the error of the positions of the free water surfaces identified by two adjacent rounds of iteration meets a preset condition, and obtaining a grid division result of the polygon unit; and performing seepage field analysis on the polygon units based on a grid division result to obtain a seepage field analysis result. According to the method, the complex seepage field is accurately simulated, and the optimal balance between high-precision discretization near the free water surface and the overall calculation efficiency is realized.

The invention discloses thermal stress crack self-repairing high-strength concrete and a preparation method thereof. The high-strength concrete is prepared from the following raw materials: water, cement, mineral powder, fly ash, silica fume, sand, gravel, a polycarboxylic acid high-performance water reducing agent and a polyacrylic acid macromolecular modifier. The molecular structure of the polycarboxylic acid high-performance water reducing agent is short in main chain polymerization degree and long in side chain polymerization degree, and contains a large number of sulfonic acid active groups; the molecular structure of the polyacrylic acid high-molecular modifier is a highly branched three-dimensional network structure, and the polyacrylic acid high-molecular modifier contains a large number of carboxylic acid groups. Through mutual cooperation of the polyacrylic acid high-molecular modifier and the polycarboxylic acid high-performance water reducing agent which are of a three-dimensional network structure, the active mineral admixture can migrate to a certain extent along with free water, meanwhile, segregation and bleeding are avoided, the concrete micro-crack repairing rate can reach 95% or above, automatic repairing of concrete early-stage cracks is achieved, and the service life of the concrete early-stage cracks is prolonged. The later cracks are not further developed, and the durability and the bearing capacity of the concrete in an acid rain environment are improved.

The invention discloses a water injection regulation and control method based on deep reinforcement learning under data and model fusion driving, and the method comprises the following steps: collecting operation parameter data under an oil field injection-production working condition, and carrying out the data preprocessing; a model-free water injection regulation strategy is designed, a traditional oil yield prediction model is removed, and a water injection action is directly generated based on an environment state by constructing a state-action space containing the parameters; a soft actor-commentator (SAC) algorithm and a long short-term memory network (LSTM) collaborative decision framework are adopted, an oil reservoir parameter time sequence rule is captured by using LSTM to provide state prediction for SAC, and water injection and oil extraction joint debugging of a well group is optimized in combination with a state-driven dynamic reward function; a priority experience playback mechanism is introduced to optimize SAC training, and the action generation efficiency is improved. According to the model constructed by the method, the calculation complexity is remarkably reduced, the oil production is improved, the water content is reduced, and the method has relatively high practical value and economic benefits and is particularly suitable for water injection regulation and control scenes under complex oil reservoir conditions.

Disclosed in the present invention are a gel having a regulatable free water content and morphology, a preparation method therefor, and the use thereof. The method comprises: S1, preparing a solution A from a natural polymer material; S2, mixing a small molecule material containing a positively charged polar group with the solution A to obtain a composite solution B; S3, mixing the composite solution B with a regulator to obtain a composite solution C, stirring same, then adding a condensing agent to the reaction system, and carrying out a curing crosslinking reaction; and S4, removing the regulator and the condensing agent to obtain the gel. By adjusting the concentrations of the natural polymer material and the regulator, gels having different morphologies can be prepared; the gel undergoes a physical process to remove hydrogen bond interaction between the gel and free water, so that the content of free water attached to the surface of the gel can be regulated, thereby regulating the physical and chemical properties of the gel. The gel of the present invention has regulatable morphology and controllable elastic modulus, and has many advantages such as good lubrication effect, good biocompatibility and biodegradability, capability of being biologically active, and capabilities of stimulating cell growth and accelerating wound repair.

The invention discloses a multifunctional polycarboxylate superplasticizer as well as a preparation method and application thereof, and belongs to the technical field of concrete admixtures, through the design of a macromolecular structure, different compounds containing quaternary ammonium salt cations and chitosan structures, polyether, unsaturated carboxylic acid and derivatives thereof are subjected to free radical copolymerization, and the multifunctional polycarboxylate superplasticizer is prepared. The polycarboxylate superplasticizer containing quaternary ammonium salt cations and a chitosan structure at the same time is synthesized. The slump loss resistance and mud resistance of the water reducing agent are better due to quaternary ammonium salt cations in the water reducing agent, the water reducing agent has good adaptability in different types of cement, meanwhile, the water reducing agent has low sensitivity to clay, the viscosity reduction effect is further improved due to a large number of hydrophobic groups contained in chitosan, and polycarboxylic acid molecules have better extensibility due to the adoption of a structure with smaller molecular weight; the thickness of a water layer film formed by polycarboxylic acid molecules with short side chains in concrete is lower, so that more free water is released to reduce the viscosity of the concrete, the synthesis process is simple, the reaction is efficient, and wide application prospects are achieved.

The invention discloses a maintenance-free water-cooled reactor and a water-cooling system that is easy to assemble. The reactor comprises a frame and a water-cooling system. The frame is provided with an iron core, and a winding is sleeved on the iron core. The water-cooling system is arranged on the frame, and the water-cooling system comprises at least one group of water-cooling plates, each group of water-cooling plates comprises a plurality of water-cooling plates connected in series in sequence, each water-cooling plate is sandwiched between the corresponding iron core and the corresponding winding, and each water-cooling plate has a first water inlet and a first water outlet. By welding, a water inlet pipe and a water outlet pipe are respectively welded and connected to the first water inlet and the first water outlet of the water-cooling plate, and the water inlet pipe and the water outlet pipe are riveted and connected in cooperation with a first sleeve pipe, thereby replacing the traditional method of using a threaded joint in cooperation with a sealing ring, achieving a better sealing effect, preventing the occurrence of water leakage, greatly improving the safety of product use, and requiring no maintenance, thus bringing convenience to use.

A method of monitoring a concentration of sanitizer in a solution includes providing a device that includes a plurality of sensors. The method continues by executing, via the device, a calibration stage that includes placing the device in sanitizer-free water, wherein the device: determines a temperature of the water; conducts a water analysis; and measures, via at least one sensor, a baseline resistance of the water. Sanitizing compounds are added to the water; and the device executes an operational stage, wherein the device: determines a resistance of the water with the sanitizing compounds; calculates a concentration of the sanitizing compounds in the water, wherein the concentration is based on the temperature of the water, the water analysis, and the baseline resistance; compares the calculated concentration to a predetermined threshold concentration; and activates an indication module of the device based on the comparison of the calculated concentration to the predetermined concentration.

The invention relates to the technical field of soil physical parameter in-situ measurement, and discloses a soil layer natural water content portable intelligent measuring instrument based on multi-source sensing fusion, which comprises a composite probe assembly and an intelligent measurement and control host which are physically connected, the composite probe assembly is configured to be inserted into a soil layer to be tested to construct a multi-physical field test environment, and an electrical transceiving unit and an acoustic transceiving unit are integrated in the composite probe assembly. By constructing a cross physical field excitation and multiphase parameter collaborative decoupling mechanism, a multidimensional dynamic correlation model is established by using the thermosensitive drift characteristic of the sound velocity of a mixed medium during thermal disturbance and the transient step response of a dielectric constant under an acoustic radiation force field; the problems that the coupling influence of the water content and the volume weight cannot be distinguished and the conductivity of bound water and the conductivity of free water are difficult to separate in a traditional means are effectively solved, and four independent physical quantities including the volumetric water content, the in-situ dry volume weight, the bound water content and the actual conductivity of pore water are synchronously inverted through a single probe. And the decoupling precision of the equipment on complex multi-phase soil medium parameters is improved.

The invention relates to the technical field of water supply control, and discloses an intelligent quality-based pressure-superposed non-negative pressure water supply control system and method, and the system comprises a data collection control module, a volume identification module, a water age observation module, a mixing decision module, and an impedance verification module. The effective volume parameters of the steady flow compensation tank are inversed through the pressure response characteristics of the variable frequency booster pump set in the starting stage; dynamically calculating the hydraulic retention time in the tank based on the system flow and the effective volume; when the residence time exceeds a safety threshold value, a forced mixing strategy is generated, and municipal inlet water is driven to be mixed with residence water by adjusting the opening degree of a bypass electric adjusting valve and controlling a pump set to operate; and meanwhile, verifying the effectiveness of the mechanical action of the valve according to the deviation between the real-time power and the theoretical reference power of the pump set after the regulation instruction is issued. Volume parameters can be corrected in real time, aged water is actively replaced under the low-flow working condition, closed-loop verification is carried out on faults of an executing mechanism, and the water supply quality and the system reliability are guaranteed.

The invention belongs to the technical field of building materials, and provides film-coated modified high-molecular water-absorbent resin, flow-state solidified soil with the film-coated modified high-molecular water-absorbent resin and a preparation method of the flow-state solidified soil with the film-coated modified high-molecular water-absorbent resin. The super absorbent polymer (SAP) material is coated to limit or prevent the SAP from absorbing water in the mixing and construction process, so that enough preset time is reserved, then a coating film on the surface of the SAP is gradually dissolved, and the free water in the convective solidified soil is rapidly absorbed. Therefore, the shrinkage problem of the flow-state solidified soil and the adverse effect of durability caused by high water consumption are effectively solved, water is gradually released in the later period to promote hydration, and the strength of the flow-state solidified soil is further improved.

The utility model discloses an environment-friendly portable moss pigment tray device which comprises a packaging box body, an installation cavity is formed in the packaging box body, a pigment tray body is embedded in the installation cavity, and a first sealing cover is hinged to one side of the installation cavity in an opening and closing mode. The side, away from the hinged position, of the first sealing cover is in locking fit with the mounting cavity through a first fixing buckle. The pigment tray body comprises an empty groove formed in the middle and a plurality of small partition grids which are arranged around the empty groove and are independent of one another, the side walls of the adjacent small partition grids are attached to one another, and an opening in the top of each small partition grid is in independent sealing fit through a water-soluble film. A detachable drying mechanism, a plurality of inactivated moss spores and nutrient substance particles without free water are arranged in each small partition grid; the moss paint tray is convenient to use and transfer, and the moss paint tray is stored in a shady and cool environment, so that a moss picture is convenient to manufacture.

The invention provides a quick-response concrete segregation treatment agent, and belongs to the technical field of building materials. Comprising the following components: an acrylic acid-acrylamide-N-vinyl pyrrolidone copolymer, betaine modified sodium alginate and calcined phosphogypsum. The efficient performance is achieved through the multi-component synergistic effect and process innovation. The core component acrylic acid-acrylamide-N-vinyl pyrrolidone copolymer adsorbs free water through carboxylic acid groups, acylamino is complexed with the water reducing agent, a spatial network is formed in combination with the salt resistance of NVP, and fluidity and segregation resistance balance are optimized; glycine betaine modified sodium alginate enhances cement adsorption and a calcium cross-linked network through zwitterions in an alkaline environment, so that moisture is quickly fixed; pores in the concrete are filled with the calcined phosphogypsum, and migration channels of free water are reduced; and finally, the effect of quickly responding to segregation is realized.

The utility model discloses an extrusion dehydrator dehydration system which comprises a shell, a dehydration assembly is connected in the shell, a water collecting groove is formed in the inner bottom face of the shell in the length direction of the shell, the water collecting groove is formed below the dehydration assembly, the water collecting groove is formed in the length direction of the dehydration assembly, and an extrusion pushing assembly is connected in the dehydration assembly in a sleeved mode. The end of the extrusion pushing assembly is connected with a motor. Free water is introduced into low-medium-pressure and low-pressure areas to be discharged by utilizing the self-weight fluidity of the free water and the pressure difference of different areas formed by screw extrusion, so that the medium leakage is reduced, the dehydration effect of the extruder is improved, the product loss is reduced, the production efficiency of products in the extrusion dehydration process is improved, and the production cost is reduced. Equipment cleaning and maintenance and material waste are reduced, the product percent of pass is improved, the service life of equipment is prolonged, the maintenance cost is reduced, and the economic benefit of the equipment is improved.

The invention discloses a filter structure for separating free water and solid particles in air, the filter structure comprises a shell, a filter element and a conical wind scooper, the conical wind scooper is arranged in the shell, the conical wind scooper divides the space of the shell into an upper cavity and a lower cavity, the upper cavity is internally provided with a separation assembly, and the lower cavity is internally provided with a filter element; the separation assembly comprises an airflow segmentation assembly, a separation silk screen and a silk screen supporting piece, the separation silk screen is arranged between the airflow segmentation assembly and the silk screen supporting piece, the silk screen supporting piece comprises a supporting outer ring, a first spring, a supporting inner ring, a cross-shaped supporting rod and a fixing ring, and the end of the cross-shaped supporting rod penetrates through the supporting inner ring to be connected with the supporting outer ring; a hollow supporting piece used for supporting the separation silk screen is formed, and the first spring is arranged between the fixing ring and the supporting inner ring; according to the structure, an upper-inlet-side-outlet filtering mode is adopted, the filtering requirements of high-humidity and high-solid-particle-content environments can be met, and most of water and particles are effectively removed through the designed airflow cutting assembly and the designed separation silk screen.

The invention discloses a culture method for improving sebastes schlegeli fry quality, which comprises the following steps: collecting sebastes schlegeli breeder seed fields in advance, artificially breeding parents by using net cages on the sea, performing nutrition rejuvenation on the parents, and obtaining offspring fry by using a method of manually squeezing fry; reasonable culture density is controlled according to different seedling specifications, and natural plant active ingredients easy to absorb are screened to be matched with common microecologics and the like for use, so that disinfection and drug use are avoided; controlling the flowing speed of aquaculture water in different growth stages. The method integrates nutrition rejuvenation, artificial farrowing, pollution-free water quality regulation and control and offspring seed behavior state regulation and control, solves the problems that parent germplasm is poor, dead offspring seeds or offspring seed activity is insufficient, growth is slow, stress resistance is poor and the like in the offspring seed breeding process, and is high in operation controllability in the breeding period, high in offspring seed survival rate and remarkable in growth promoting immune effect; the method has good prevention and treatment effects on bacterial diseases, realizes pollution-free seedling breeding, can reduce disease occurrence and death rate, reduces feed coefficient, and effectively improves culture economic benefits.

The invention relates to the technical field of oil-gas-water treatment equipment, in particular to an oil-gas-water on-site treatment integrated device which comprises an oil-gas-water separator and a cyclone separator, and the oil-gas-water separator comprises a free water separation cavity, a produced water buffer cavity, a low-water-content oil buffer cavity, a first-stage air floatation cavity, a second-stage air floatation cavity, an inclined plate cavity, a floating oil cavity and a water purification cavity; the cyclone separator is communicated with the free water separation cavity; a low-water-content oil buffer cavity is arranged below the produced water buffer cavity; air flotation center cylinders are arranged in the first-stage air flotation cavity and the second-stage air flotation cavity; a floating oil cavity is arranged below the inclined plate cavity; the purified water cavity is connected with a purified water outlet pipe; the purified water outlet pipe is connected with the dissolved air pump, the dissolved air pump is further connected with the oil-gas-water separator and the bubble filter, the top of the bubble filter is communicated with the top of the oil-gas-water separator, and the side faces of the bubble filter are connected with the two dissolved air releasers respectively. According to the invention, a station is formed by one skid, oil-gas-water three-site treatment is realized, the technological process occupies a small area, intensification is realized, the auxiliary process is simplified, and the working efficiency is high.

The invention relates to the technical field of oilfield chemistry, and discloses a thickening agent composition, a thickening agent as well as a preparation method and application of the thickening agent. The thickening agent composition contains a polymer A having a hydrazide structure and a polymer B having a carbonyl structure, wherein the polymer A has a structural unit derived from a first nonionic monomer, a structural unit derived from a first anionic monomer, and a structural unit derived from a hydrazide group-containing monomer; and a polymer B having a structural unit derived from a second nonionic monomer, a structural unit derived from a second anionic monomer, and a structural unit derived from a carbonyl group-containing monomer. According to the thickening agent disclosed by the invention, the thickening agent has excellent temperature resistance and salt resistance, and the shearing force of the solid-free water-based drilling fluid can be remarkably improved.

The invention belongs to the technical field of testing, and particularly relates to a high-pound-level thin-wall part flange-free water pressure test anti-deformation device which comprises a workbench, a positioning assembly, a pressurizing assembly and a rotating assembly, the positioning assembly is arranged above the workbench and comprises a supporting circular plate, a hollow cylinder is fixed to the bottom of the supporting circular plate, and the rotating assembly is arranged on the supporting circular plate. The hollow cylinder is rotatably matched with the working table, a plurality of positioning bosses for positioning a test piece are arranged on the upper surface of the supporting circular plate, the pressurizing assembly is used for increasing water pressure for the test piece and comprises a plurality of plugging blocks arranged above the working table, and the plugging blocks coaxially correspond to the positioning bosses respectively. According to the invention, a traditional direct clamping and fixing mode is abandoned, so that the possibility that the test pieces are extruded and deformed by external force when being fixed is avoided, in addition, a plurality of test pieces are tested at the same time, the working continuity is high, the time required by the test is effectively shortened, and the test efficiency is improved.

The invention relates to the technical field of cleaning of water storage devices, in particular to a self-adaptive lacing-bar-free water tank automatic cleaning device and a cleaning method.The self-adaptive lacing-bar-free water tank automatic cleaning device comprises a water storage mechanism which comprises a supporting base and a lacing-bar-free water tank body fixedly arranged at the top end of the supporting base, and a drainage pipe is arranged on the lacing-bar-free water tank body; the water supply mechanism comprises a water inlet pipe fixedly arranged at the top of the tiepiece-free water tank body and a filling pipe arranged at the end part of the water inlet pipe, and further comprises a branch pipe connected with the water inlet pipe; the cleaning mechanism comprises a conveying assembly arranged on the tiepiece-free water tank body in a penetrating mode and a rotating assembly fixedly arranged on the conveying assembly, a first motor controls a small gear to rotate, ring teeth can rotate, then a rotating sleeve rotates, the cleaning angle of a flat sweeping spray head is changed, and multi-angle cleaning is achieved; and cleaning dead angles can be avoided, and the cleaning efficiency and the cleaning effect are improved.

The invention relates to the field of nucleating agent material preparation, in particular to calcium hexahydrophthalate as well as a preparation method and application thereof. The invention relates to a preparation method of calcium hexahydrophthalate, which comprises the following steps: dissolving: dissolving hexahydrophthalic acid in alcohol to obtain a hexahydrophthalic acid-alcohol solution; and acid-base neutralization: adding calcium hydroxide into the hexahydrophthalic acid-alcohol solution to react, filtering, and drying to obtain the hexahydrophthalic acid calcium. According to the invention, hexahydrophthalic acid and calcium hydroxide are subjected to an acid-base neutralization reaction in an alcohol liquid, and most of generated water molecules are adsorbed by the alcohol liquid, so that the water molecules are difficult to combine with calcium hexahydrophthalate to form a crystalline hydrate. And meanwhile, only alcohol liquid and trace free water need to be removed during drying, so that the energy consumption and the time cost are reduced.

The present invention provides a fluorine-free water- and oil-resistant coating composition comprising 30 wt % to 97 wt % biodegradable polymer in dry weight, less than 25 wt % crosslinking agent in dry weight, less than 25 wt % nanoparticles, less than 15 wt % plasticizer, less than 15 wt % surfactant and less than 1 wt % antifoaming agent in dry weight. The fluorine-free water- and oil-resistant coating composition relates to green chemistry and demonstrates both water resistance and grease resistance.

The invention discloses a primer and a method for quantitatively monitoring the biomass of sargassum hemiphyllum based on an environmental DNA technology, and belongs to the technical field of molecular ecology. The primer probe group comprises an upstream primer, a downstream primer and a fluorescent probe which are specifically targeted to the sargassum hemiphyllum mitochondria COX1 gene, and the sequence is shown as SEQ ID NO.1-3. The kit comprises the primer probe group, a qPCR (quantitative polymerase chain reaction) premixed solution, nuclease-free water and a sargassum hemiphyllum plasmid positive control. The method comprises the following steps: collecting a water sample, enriching eDNA, performing qPCR detection by using the primer probe group after extraction and purification, and realizing qualitative detection and quantitative evaluation of sargassum hemiphyllum through a Cq value or a standard curve. The method disclosed by the invention has the advantages of high sensitivity, strong specificity, no damage to the environment and target organisms, capability of realizing large-scale rapid general survey and the like, and is suitable for early warning of gulfweed blooms, investigation of population distribution and evaluation of ecological influence.