437 results about "Dropping funnel" patented technology

A method for preparing a polycarboxylate super plasticizer modified by utilizing straw comprises a step (1) of pretreating straw; and a step (2) of preparing the polycarboxylate super plasticizer modified by utilizing the straw. The concrete process comprises a first step of adding raw materials in a four-neck flask; a second step of adding distilled water, and warning to 70-90 DEG C; a third step of installing an upper backflow device and a constant pressure dropping funnel, adding ammonium persulfate into the constant pressure dropping funnel, starting to add an initiator ammonium persulfate dropwise, and performing heat insulation for 4-5 h after the initiator is added dropwise; a fourth step of performing cooling to 35-45 DEG C, and adjusting the pH to 6.8-7.2, so that the polycarboxylate super plasticizer modified by utilizing the straw can be obtained. In sum, according to the polycarboxylate super plasticizer product modified by utilizing the straw, the wheat straw has a high influence on a polycarboxylate super plasticizer synthesis process, the ratio of other raw materials is affected, the cost is reduced, the reaction time is reduced by 1 hour, the time is saved, and the cost performance is higher compared with the original process.

The invention discloses a synthesis method of an organic silicon modified acrylate copolymer by using an emulsion copolymerization method. The synthesis method comprises the following steps: (1) synthesizing organic silicon seed emulsion: adding emulsifier and deionized water according to a proportion in a formula into a three-mouth flask provided with a stirrer, a dropping funnel and a reflux condensing tube by using a semicontinuous dropping method, adjusting the bath temperature to 75 DEG C, then, adding catalyst and dropwise adding organic silicon monomers, and after the dropwise adding is finished, introducing nitrogen gas for 30 minutes; reacting for 5 hours, slowly cooling, adjusting the pH value of the system to 7-8 by using 10% sodium carbonate solution and standing the solution for 12 hours; and (2) carrying out graft copolymerization by using acrylic ester monomers: dropwise adding acrylic ester monomers and initiator by also adopting the semicontinuous dropping method after adjusting the reaction temperature to 75 DEG C, and introducing nitrogen gas for 30 minutes; reacting for 5 hours, adjusting the pH value to 7-8 by using ammonia water; and discharging. The synthesis method is simple in process, efficient and environment friendly, the organic silicon content of the prepared emulsion is over 50%, and no agglomeration is generated.

The invention relates to an infusion set and belongs to the technical field of medical apparatus and instruments. The infusion set comprises a puncture outfit, an upper conduit of a drop funnel, a drip tube, the drop funnel, a lower conduit of the drop funnel, a regulator and an intravenous needle which are sequentially connected. The liquid outlet end of the intravenous needle is sleeved with a sealing sleeve; an air exhaust pipe is arranged between the drop funnel and the lower conduit of the drop funnel; at least one air exhaust hole is formed at one end, which is positioned in an inner cavity of the drop funnel, of the air exhaust pipe; a liquid medicine passing membrane made from a material which is permeated by water is arranged above the air exhaust pipe; a group of pores are formed on the liquid medicine passing membrane; the liquid medicine passing membrane allows liquid medicine and gas to pass through but blocks insoluble granules with the diameter of greater than the diameter of the pores in the liquid medicine; the sealing sleeve seals the liquid outlet end of the intravenous needle; and an air filter is arranged on the sealing sleeve. The infusion set is simple in structure and has self-exhausting and automatic liquid-stopping functions.

The invention relates to a method for preparing ultraviolet photocuring polyurethane resin based on polybasic isocyanate and polybasic hydroxy polyacrylate. The method comprises the following steps of: 1) adding monohydroxy acrylic ester, butanol and dibutyltin dilaurate into a constant-pressure dropping funnel; 2) regulating the temperature of an oil bath pot to be between 20 and 50 DEG C after dropping is finished in the step 1), reacting for 1 to 2 hours and stopping the reaction; 3) adding 20 to 30 weight parts of polyhydroxy acrylic resin and 0.5 to 1.5 weight parts of inhibitor 4-methoxy phenol into a reaction product obtained in the step 2); and 4) adding 5 to 15 weight parts of active monomer thinner according to the solid content to obtain a product. The method has the advantages of performing polyfunctional monomer premature crosslinking, introducing more double bonds, and improving the crosslinking and relative molecular weight of a paint film; and the product has high mechanical properties and greatly improved corrosion resistance.

The invention discloses a method for separating and modifying the pyrolysis bio-oil into modified bio-oil includes the following steps: A, according to the mass ratio of mbio-oil:methanol:moxidant:macidic catalyst is equal to 50-150:30-100:20-100:1, pyrolysis bio-oil, anhydrous alcohol and acidic catalyst with 20-30 percent by mass of water are added into a tower reactor of a distillation tower and heated to refluxing state, the oxidants is added drop by drop into the reactor through a dropping funnel followed by refluxing for 15min, and when the temperature of the tower top is decreased to 47-55 DEG C, total reflux is proceeded for 2h; B, after total reflux, three sets of fractions: below 55 DEG C fraction, 55-78 DEG C fraction, and 78-79 DEG C fraction are intercepted with the reflux ratio of 1:1-10; C, after collecting the fraction on the tower top, the tower reactor liquid after step B is collected for condensing and layering, then the upper layer water phase is treated as waste water, and the lower layer oil phase is dissolved in ethanol to form heavy oil; D, the components are filtered to redistill in distillation tower to obtain the light oil and recover the ethanol.

The invention discloses a slow flow device for a disposable transfusion set. The transfusion set comprises an upper dropping funnel and a lower dropping funnel; a liquid blocking device consists of inner and outer covers of a floating ball and a liquid blocking membrane; the slow flow device comprises a liquid level blocking column arranged at the bottom of the lower dropping funnel; the top of the liquid level blocking column is an inclined surface; the inclined surface is provided with at least one groove; the groove comprises an upper port and a lower port; the cross section of the upper port is larger than that of the lower port; and when the liquid blocking membrane is jointed with the liquid level blocking column, a medicinal liquid in the lower dropping funnel flows through the upper port and the lower port in sequence, and flows into a transfusion conduit. According to the slow-flow device for the disposable transfusion set, the medicinal liquid in the lower dropping funnel can enter from the upper port of the groove and slowly flows into the transfusion conduit from the lower port of the groove through the groove formed on the liquid level blocking column of the lower dropping funnel when the liquid blocking membrane of the liquid blocking device is jointed with the liquid level blocking column; and after complete dripping, air is supplemented, and a liquid in the conduit slowly flows into a human body continually, so that the dripping time of the medicinal liquid is prolonged, and blood reflowing is prevented.

The invention relates to a preparation method of strawberry-type polystyrene-silicon dioxide nanocomposite microspheres. The preparation method comprises the following steps: in a nitrogen atmosphere, mixing methacryloyloxyethyl trimethyl ammonium chloride, octaphenyl polyoxyethyiene and deionized water to obtain a water-phase mixture; dissolving azodiisobutyronitrile into styrene and n-hexadecane through ultrasonic wave to obtain an oil-phase mixture; dropping the oil-phase mixture into the water-phase mixture by using a constant-pressure dropping funnel to obtain mixed liquid; performing ultrasonic treatment on the mixed liquid under an ice-water mixed bath condition to obtain miniemulsion; dropwise adding silicon dioxide nanosol into the miniemulsion, and heating to obtain milky dispersion liquid; collecting and cooling the dispersion liquid, and centrifugating and dispersing until no free SiO2 particles exist under a transmission electron microscope, so as to obtain the strawberry-type polystyrene-silicon dioxide nanocomposite microspheres finally. The preparation method is simple and relatively low in cost and the SiO2 cladding rate is relatively high.

The invention discloses an automatic exhaust medicinal intravenous infusion set, which comprises a liquid inlet assembly, a dropping funnel, a liquid outlet assembly and a disposable intravenous injection needle which are connected in turn. A dropping funnel cover covers an opening of the dropping funnel in a sealing mode and a dropping tube and a liquid medicine injection part are arranged on the dropping funnel cover; and an automatic exhaust assembly is integrally arranged on the side wall of the dropping funnel and comprises a vent hole, a hole cover and a ventilated filtering membrane, wherein the vent hole is integrally molded with the side wall of the dropping funnel; the hole cover comprises a cap capable of opening and closing; and the ventilated filtering membrane is positioned between the hole cover and the contact surface of the vent hole and does not exhaust liquid but air. By ingeniously adopting a structure of integrally arranging the automatic exhaust assembly on the side wall of the dropping tube, the automatic exhaust medicinal intravenous infusion set has the advantages of effectively guaranteeing that the dropping funnel cover has the sealing performance of the conventional common intravenous injector, reducing the operating difficulty of medical care personnel, greatly reducing the probability of existing and accumulating air bubbles in an inner cavity of the dropping funnel, efficiently and reliably exhausting the air bubbles in the dropping funnel completely, fully guaranteeing the safety and reliability for infusion, along with simple structure, easy manufacture and high practicality.

The invention discloses a safe and automatic hydraulic control opening and closing valve, which is arranged in a dropping funnel. The safe and automatic hydraulic control opening and closing valve is characterized by comprising a valve body, a valve cover, an upper floating body and a sealing body, wherein the valve body comprises a frustum section; a liquid outlet hole on the valve body is fixedly connected with the liquid outlet hole in the dropping funnel; a through hole through which a floating body connection rod passes is arranged at the center position of the valve cover; the valve cover is locked on the valve body; the upper floating body is connected with the sealing body through a hollow floating body connection rod; the upper floating body is arranged outside the valve body; the sealing body forms a frustum shape and is arranged in the valve body, and the sealing surface on the sealing body and an inclined plane on the frustum section of the valve body are in contact to be sealed. The automatic hydraulic control opening and closing valve disclosed by the invention has good stopping effect, can conveniently release stopping, and can be continuously used.

The invention discloses an intelligent infusion device based on a wireless network, comprising a dropping funnel (20), a flexible pipe (8), a dripping speed monitoring device (1), a display screen (2), a wireless transmit-receive device (3), a dripping speed controller (4), a microcontroller MCU (5) and a movable type infusion controller (6), wherein the flexible pipe (8) is communicated with both ends of the dropping funnel (20); the dripping speed monitoring device (1), the display screen (2) and the microcontroller MCU (5) are integrated on a circuit board (90), and the circuit board (90) is arranged on the dropping funnel (20); and the wireless transmit-receive device (3) and the dripping speed controller (4) are arranged on the flexible pipe (8) positioned below the dropping funnel (20) and are respectively connected with the microcontroller MCU (5) arranged on the circuit board (90) through lead wires. The invention realizes the whole-course intelligent control in the infusion process, so that medical workers can more conveniently and comprehensively know the information of patients in the treatment process.

The invention relates to a microporous anti-backflow transfusion apparatus, belonging to the field of medical appliances. The microporous anti-backflow transfusion apparatus comprises a bottle insertion needle, a dropping funnel, a guide tube and a transfusion needle, wherein a bipass is arranged in the dropping funnel; the lower end of the bipass is communicated with a lower guide tube, and the upper end is open; the tube wall penetrates through a guide line; a floater is arranged in the dropping funnel, and provided with a locating pin fixed on the bottom of the floater; the locating pin penetrates through the center of a closing membrane; the closing membrane is provided with an anti-backflow micropore; and the wall of the dropping funnel is provided with an exhaust window capable of implement automatic exhausting. After the liquor runs out, the closing membrane automatically closes the upper opening of the bipass, thereby achieving the goal of automatic liquor stop; and the anti-backflow micropore and the guide line suck the residual liquor into the bipass and the lower guide tube to maintain very slow and trace transfusion, thereby performing the anti-backflow function.

The invention relates to a process for synthesizing collector of metal, in particular to a process for synthesizing sodium butyl xanthate. The invention provides the process for synthesizing the sodium butyl xanthate, which is easy to operate and is high in yield, and a product produced by the method has high quality. The technical scheme adopted in the invention is that: the sodium butyl xanthate is synthesized by a crystallization method and the process comprises the following steps of: adding n-butyl alcohol and carbon disulfide into a 250 ml dried neck flask in which a stirring device, a thermometer and a dropping funnel are arranged, wherein the molar ratio of the n-butyl alcohol to the carbon disulfide is 1:1.0-1:1.5; adding powdered NaOH, wherein the molar ratio of the n-butyl alcohol to the NaOH is 0.8:1-1.2:1; and adding solvent benzene and reacting at the temperature of between 5 and 35 DEG C for 0.5 to 1.5 hours.

The invention discloses a method for preparing an amphiprotic humic acid grafted copolymer coal water slurry dispersing agent. The method comprises the following steps: adding an 30% humic acid aqueous solution into a three-necked flask in which a stirrer, a condenser pipe, a dropping funnel and a thermometer are arranged, regulating the pH value to 9-10 by using an alkaline regulator, stirring and dissolving; raising the temperature to 65-85 DEG C, respectively dropping an initiator solution and a mixed monomer solution consisting of an anionic monomer, a cationic monomer and a polyether macromonomer, controlling the dropping rate until the dropping operation is finished within 1-1.5 hours, and preserving the temperature and reacting for 3-5 hours after the operation is ended; and finally, cooling the reactant to room temperature, filtering, discharging, drying and grinding. The dispersing agent prepared by the method has the characteristics of good dispersing effect, high stability and low cost and can be used for preparing various kinds of high-concentration coal water slurry.

The invention relates to a method and a device for detecting dropping speed of liquid medicine, in particular to a method for detecting speed of intravenous infusion and a device therefor. The device comprises an electromagnetic wave generator, an emitting antenna, an electromagnetic wave receiver, a receiving antenna and an electromagnetic wave processor. If the radar echo frequency is not changed, that no liquid medicine is dropped in a dropping funnel of an infusion apparatus is judged; if Doppler frequency shift exists between radar waves and echo, that liquid medicine is dropped in the dropping funnel of the infusion apparatus is judged; and the blanking time for dropping each drop of the liquid medicine is calculated to obtain infusion drop number in each minute, and the infusion quantity in each minutes is converted according to the volume of each drop of the liquid medicine. The device has high sensitivity, strong radio interference resistance, no optical radiation, small output power of electromagnetic waves and low power consumption, and is not influenced by the lighting environment outside.

The invention discloses a large plastic pin assembling system comprising base, a driving disc (1), large plastic pin clamps (2), as well as a dropping funnel feeding device (3), a puncture outfit side dispensing device (4), a puncture outfit mounting device (5), a turning device A (6), a two-way side dispensing device (7), a two-way mounting device (8), a turning device B (9), a puncture outfit protecting sleeve mounting device (10), a guiding device (11), an air filter film mounting device (12), an air inlet plug hole dispensing device (13), an air inlet plug mounting device and a product discharging device (15) which are arranged on the base at the periphery of the driving disc (1) in sequence, wherein the large plastic pin clamps (2) are fixedly installed on the driving disc (1) and distributed uniformly along the circumferential direction of the driving disc (1). The large plastic pin assembling system has the beneficial effects that the full-automatic assembly process of a large plastic pin assembly is realized, the operation is smooth, the assembly is rapid, the labor cost is saved, the labor intensity of operation staff is alleviated, and the production efficiency is improved greatly.

The invention relates to an infusion apparatus assembly process, which comprises four steps of conduit extrusion, accessory assembly, leakage detection and packaging. The accessory assembly is that assembled semi-finished accessories such as a puncture outfit, a drop funnel, a flow regulator and a liquid medicine filter are directly assembled on a conduit; and after extrusion and cutting, the conduit is directly wound, is shaped by a tape and always keeps the winding state in the operating processes of accessory assembly, leakage detection and packaging. After the leakage detection, the conduit is communicated with other accessories and then is directly packaged into a bag to form an infusion apparatus product. The process effectively combines conduit extrusion, cutting, winding, assembly, leakage detection and packaging, reduces the turnover to and fro between various working procedures, reduces overstocked products of the various working procedures, and has the advantages of high production efficiency and reliable work.

The present invention relates to a kind of synthetic method of food spice 1,2,3,5,6-pentathiocycloheptane, the steps are as follows: firstly thiating: in a three-necked reaction flask equipped with a stirrer, a constant pressure dropping funnel, and a thermometer Add sodium tetrathiocarbonate and absolute ethanol to the mixture and stir until sodium tetrathiocarbonate is completely dissolved. Add the absolute ethanol solution of diiodomethane dropwise with a constant pressure dropping funnel within 2 hours at 25°C. Stir and react at a constant temperature of 25°C for 10 hours; second extraction: dilute the above reaction solution with water, then extract three times with cyclohexane, separate the water layer and combine the extracts, add anhydrous calcium chloride for drying; finally obtain the finished product by distillation. The invention provides an edible spice 1,2,3,5,6-pentathiacycloheptane with strong characteristic fragrance, good antibacterial activity and biological activity. The process is simple and the yield is high, and it can be safely used as a spice in It is a new type of mushroom flavor during frying, frying, cooking, frying and other cooking processes.

The invention relates to a sterile medical appliance for clinical transfusion, in particular to an automatic exhaust transfusion system. The automatic exhaust transfusion system comprises a bottle cork puncture outfit protective casing, a bottle cork puncture outfit, a short transfusion catheter, a short exhaust catheter, an air filter, a dropping funnel cover, an automatic exhaust component, a liquid medicament injection element, a dropping funnel, a flow rate adjuster, a long transfusion catheter, a liquid medicament filter and a disposable intravenous infusion needle, wherein the automatic exhaust component is arranged on the dropping funnel cover and consists of an exhaust needle and the air filter; the exhaust needle runs through the dropping funnel cover to cling to the inner wall of the dropping funnel and be extended into the dropping funnel; the air filter is arranged at the upper end of the dropping funnel cover and is linked with the exhaust needle; and an air filter membrane is arranged in the air filter. The automatic exhaust transfusion system can effectively prevent bubbles from being produced and entering the transfusion catheters, and has the characteristics of simple structure, safety and reliability.

The invention discloses an automatic exhaust blood-return-resistant infusion apparatus. The infusion apparatus comprises a bottle plug puncture outfit protective sleeve, a bottle plug puncture outfit, an air filter, a dropping funnel, a flow regulator, a liquid medicament filter, a disposable venous infusion needle and the like and is characterized in that: a precision liquid medicament filtering membrane is arranged at a bottom end inside the dropping funnel; a concave cavity is formed in the middle of a bottom plate inside the dropping funnel; an annular plane is processed around the concave cavity of the bottom plate; the precision liquid medicament filtering membrane is tightly attached to the annular plane of the bottom plate by ultrasonic or high frequency heat seal; the concave cavity of the bottom plate can allow the liquid medicament flowing through the precision liquid medicament filtering membrane to be filtered fully; and an automatic venting device consisting of a venting plug, an air filter and a venting needle is arranged on a dropping funnel cover. The infusion apparatus has the advantages of venting automatically in an infusion process, automatically preventing the liquid medicament from flowing, preventing blood from flowing backwards, simplifying venting operation steps and reducing the working strength of medical care personnel, along with the advantages of simple structure, safety and reliability.

The invention relates to ultraviolet-curing modified epoxy acrylic resin and a preparation method thereof. A synthesis method comprises the steps that a raw material, namely epoxy resin and 1,2-cyclohexanediol diglycidyl ether (CD-1180) at different ratios are put into a reactor; stirring is performed; heating is performed to 80-90 DEG C; a measured catalyst is added; a constant-pressure drop funnel contains acrylic acid and a polymerization inhibitor to dropwise add within 0.5-1.0h; timing is started; heating is performed gradually; a reaction is performed for 1h; an acid value is measured; the reaction is stopped when the acid value of a reactant is less than or equal to 3mgKOH / g after about 4-6h; discharge is performed; and the modified epoxy acrylic resin is obtained. The modified epoxy acrylic resin obtained by the method has the characteristics of low viscosity and convenience in use; compared with the current commercially available product, the viscosity is greatly improved; the storage stability is good; and the weather resistance and the flexibility of a paint film are superior to the traditional commercially available epoxy acrylic resin after ultraviolet-curing film forming.

The invention discloses a transfusion apparatus which has automatic air exhaustion and self destruction, and consists of a puncturing apparatus of a bottle stopper, a catheter and a dropping funnel, and the invention is characterized in that an air exhausting tube is arranged inside the dropping funnel, and the lower end of the air exhausting tube is communicated with a lower catheter, the upper end of the air exhausting tube is oblique, and when liquid medicine is injected into the dropping funnel, the extra air in the dropping funnel automatically exhausts through the air exhausting tube. Liquid medicine flows into the lower catheter through a transfusion orifice when the liquid surface is higher than the transfusion orifice of the air exhausting tube. The extra air in the dropping funnel exhausts before liquid medicine flows into the lower catheter, thus bubble is not formed and automatic air exhaustion is achieved. The residue liquid under the transfusion orifice in the dropping funnel can not be discharged, cleaned and reused, thus achieving the effect of self destruction.

The invention discloses a method for preparing a material for adsorbing heavy metal ions and rare earth ions and relates to functional complex particles. The method comprises the following steps: performing chemical modification on the surface of silica gel, and preparing silica gel particles AMPS-SiO2 subjected to surface modification; mixing 1.2-1.4g of silica gel particles AMPS-SiO2, 80mL of distilled water and 16.54-17.67g of monomer sodium styrene sulfonate (SSS), adding 20mL of aqueous solution in which 0.42-0.44g of ammonium cerous sulfate and 0.3mL of concentrated sulfuric acid are dissolved into a constant-pressure dropping funnel, carrying out a mixed reaction, and separating product particles to obtain the grafted particle PSSS / SiO2. The grafted particle PSSS / SiO2 has the characteristics of anionic polyelectrolyte, has excellent mechanical property and high thermal and chemical stability of the silica gel particles and has high adsorption performance on the heavy metal ions and rare earth ions.

The invention relates to a preparation method of an acrylic polymer retanning agent for retanning of high elastic leather. Deionized water and isopropanol are added into a three-neck flask which is placed into a water bath for heating and stirring. Mixed acrylic monomers are added into a dropping funnel of constant pressure, ammonium persulphate is dissolved into the deionized water and added into another dropping funnel of constant pressure and after water temperature is raised to 70 DEG C to 80 DEG C, the mixed monomers and an initiator are started dripping simultaneously and controlled to be finished dripping in 60 min to 90 min and the temperature is raised to 80 DEG C to 85 DEG C, which is kept so as to take a reaction. After the reaction, a room temperature is cooled to, systematic pH is adjusted to 4.5 to 6.0, and solvent is distilled off the system completely, and finally discharging is carried out. The acrylic polymer retanning agent of the invention has advantages of easy getting of raw materials, relatively simple experimental operation, the retanning agent prepared with a plurality of different side chain base groups, thus improving elasticity of the leather significantly, increasing value-added content of leather products and reducing dosage of chrome tanning agent and providing with great economic benefit and environmental benefit.

The invention discloses core-shell type emulsion with PTFE as a core and a preparing method thereof. PTFE dispersion liquid and deionized water are added into a three-necked flask with a constant-pressure dropping funnel and a spherical condenser pipe according to mass parts to be stirred evenly and heated in nitrogen so that seed emulsion can be obtained; mixed monomer is dropped through the constant-pressure dropping funnel, the total amount of monomer is 10-1,000 according to mass parts, swelling is conducted, then, initiator is added for initiating polymerization, reaction is conducted for 24 h, filtering is conducted, ammonium hydroxide is used for adjusting the pH value of the solution after cooling, and the core-shell type emulsion with PTFE as the core is obtained. The level of the adhesive force of an emulsion coating and a rubber surface can reach 4B, and the adhesive force is improved remarkably; contact angle and water absorption test results of emulsion rubber films show that the contact angle of the emulsion latex films can reach 117.94 degrees, the water absorption can be as low as 9.62wt%, and the hydrophobicity of the emulsion latex film is good through comprehensive analysis.

The invention relates to a low adsorption multi-layer co-extrusion light-proofing infusion apparatus, comprising a puncture, an air filter, a dropping funnel, a flow regulator, and a liquid filter with infusion catheter linking the above mentioned parts in between. The invention is characterized in that the infusion catheter and the dropping funnel adopt a multi-layer structure, and the outer layer is made of medical PVC with additive light-proof powder, the inner layer is nonpolar medical TPE thermoplastic elastomer). The invention eliminates the possibility for the light-proof system to precipitate from the infusion apparatus, and meets the need of clinical light-proofing infusion safely and effectively. The inner layer does not absorb the medical liquid at all, so that wastes of medicine are avoided. The product of the invention is simple in structure and easy to use as ordinary infusion apparatus.

The invention relates to an automatic exhausting anti-blood backflow infusion apparatus, which comprises a bottle cork puncture outfit, a dropping funnel, an anti-blood backflow filter, a lower catheter, an infusion needle and the like. The automatic exhausting anti-blood backflow infusion apparatus is characterized in that: the dropping funnel is at least provided with an exhausting window sealedby an air filtering membrane; and the lower end of the dropping funnel is provided with a terminal sheath of the anti-blood backflow filter to seal a terminal. When the infusion apparatus operates, liquid medicine flows into the dropping funnel under the action of gravity, and redundant air is discharged from the exhausting window; and the terminal sheath is removed during infusion, and the liquid medicine flows out of the terminal. If the liquid medicine is used up without being processed in time, the anti-blood backflow filter blocks the air to enable the liquid medicine to stop flowing andprevent the air from entering the lower catheter to achieve the aim of blood backflow prevention.

The invention discloses a polystyrene-maleic anhydride derivative water-coal-slurry additive and a preparation method thereof. The preparation method comprises the following steps of: dissolving 60 grams of polystyrene-maleic anhydride into 300ml of organic solvent, stirring in an oil bath at the temperature of 40-60 DEG C at the speed of 250-300 revolutions per minute, and preserving heat for 20-30 minutes; and dissolving 30-90 grams of naphthylamine sulfonic acid into 1,000ml of 1.5-3 percent by mass of aqueous alkali, slowly dropping with a dropping funnel, controlling the dropping speed under the condition that dropping is competed within 15-30 minutes, and reacting in an oil path at the temperature of 40-60 DEG C at the speed of 250-300 revolutions per minute under a stirring condition for 6-18 hours. The polystyrene-maleic anhydride derivative water-coal-slurry additive is an excellent water-coal-slurry additive, has a controllable chemical structure, can contribute to remarkably reducing the coal-water interface tension, and is an efficient water-coal-slurry additive with a large coal range and a small using amount.

The invention discloses a double-cavity chamber multi-channel transfusion set, which comprises a blood bag puncture needle, a brine bottle puncture needle, a blood transfusion soft cannula, a transfusion soft cannula, a three-way tube, a chamber, a soft cannula and a vena transfusion needle, the vena transfusion needle is connected with the output end of the chamber by the soft cannula, the three-way tube is positioned at the input end of the chamber, the two branch tubes thereof are respectively connected with the blood bag puncture needle and the brine bottle puncture needle through the blood transfusion soft cannula and the transfusion soft cannula that are nested with the clamp, the chamber includes a chamber bottle, a dropper arranged in the chamber bottle and a filter, the dropper is positioned at the middle part of the chamber bottle and is tightly connected with the inner wall of the chamber bottle and partitions the inner cavity of the chamber bottle into an upper cavity and a lower cavity serving as a press cavity, the filter is arranged in the upper cavity of the chamber bottle. The technique proposal can ensure the dripping amount and blood cleanness of the dropper, so the blood coagulation matters and impurities will not flow into the human body.

An automatic exhaust safety transfusion device of the invention comprises a bottle stopper puncture device, a dropping funnel, a pipe, a filter and a regulator. The invention is characterized in that the lower end of dropping funnel is installed with an exhaust pipe which upwards extends into the lower end of inner cavity of dropping funnel and is communicated with the pipe. The pipe wall of exhaust pipe is provided with at least one exhaust transfusion opening. Furthermore the filter device is provided on the pipe between the dropping funnel and the regulator. The filter comprises a filtering cavity which divides the inner cavity to a liquid inlet cavity and a liquid outlet cavity through a vertical liquid phase filtering membrane, a liquid inlet and a liquid outlet which are installed at the upper end of filtering cavity and are respectively communicated with the liquid inlet cavity and liquid outlet cavity, wherein the liquid inlet is communicated with the dropping funnel. The liquid outlet is communicated with the pipe positioned below the filter. The side wall of filtering cavity is provided with at least one air exhaust window communicated with the liquid inlet cavity. The automatic exhaust safety transfusion device of the invention effectively settles the problems of easy air bubble forming and difficult air exhaust of prior transfusion device in transfusion process and has the advantages of simple and reliable structure, convenient operation, safe use and suitability for industrial production.