84results about How to "Increase electrostatic attraction" patented technology

The invention discloses a method for synthesizing composite modified starch slurry, belonging to the technical field of methods for synthesizing the modified starch slurry applied to starching of spinning warps. The method comprises the following steps of: firstly carrying out positive ion modification on starch by utilizing quaternary ammonium type positive ion etherifying agent 3-chlorine-2-hydroxypropyltrimethylammonium chloride to synthesize positive ion starch, and carrying out an esterification reaction between the synthesized positive ion starch and dodecenylsuccinic anhydride so as to synthesize positive ion-dodecenylsuccinate composite modified starch slurry. According to the method for synthesizing the composite modified starch slurry, disclosed by the invention, positive ion groups and ester group which is large in volume and provided with vinyl group are introduced in a starch macromolecular chain so that film performances of the starch slurry is remarkably modified, and adhesion performance of the slurry to synthetic fibers such as terylene can be improved, thus starching requirements of warps, especially the terylene and the like, are better met. The method for synthesizing the composite modified starch slurry, disclosed by the invention, can be used for starching warps of fibers such as cotton, linen, mucilage glue and terylene/cotton, terylene/linen, terylene/mucilage glue through a common sizing machine or a high-speed sizing machine.

The invention relates to a method for treating a biological filler from a waste hollow fiber ultrafiltration membrane or a microfiltration membrane as a matrix, wherein a raw material of the biological filler adopts the waste hollow fiber ultrafiltration membrane or the microfiltration membrane, according to the source and the pollution situation of the raw material of the biological filler, different physical or chemical cleaning methods are adopted, and the surface roughness, the initial microbial amount or the hydrophilic property of the raw material of the biological filler can be controlled by a surface hydrophilization modification method or nano material in-situ polymerization modification method, so that the biological filler has a faster film-hanging speed compared with a conventional the biological filler; according to the source and the pollution situation of the raw material of the biological filler, a path of recycling of the waste hollow fiber membrane is realized, and hazard of waste polymers to the environment can be greatly reduced. Through use of the waste hollow fiber membrane for the preparation of the biological filler, the preparation cost of the filler can begreatly reduced, and the preparation cost of the filler is mainly due to the cost of the raw material of the biological filler and energy consumption during the preparation process.

The invention discloses a high-efficiency diamond polishing agent which is prepared from the following raw materials in percentage by weight: 5-20 percent of ultra-precision diamond micro powder, 10-20 percent of ethyl orthosilicate, 20-30 percent of solvent, 0.2-0.8 percent of strong acid, 10-30 percent of surface active agent, 10-25 percent of wetting agent, 5-15 percent of dispersing agent and 0.1-5 percent of PH conditioning agent. According to the high-efficiency diamond polishing agent, the diamond micro powder is subjected to surface modification by using ethyl orthosilicate, so that a silicon dioxide coating layer is formed on the surface of the diamond micro powder, and during polishing, the coating layer plays a role in buffering the diamond micro powder on the inner layer; through performing multiple times of crushing and shaping on the diamond micro powder and improving surface modification process, the morphology of the diamond micro powder is closer to an octahedron; the prepared polishing agent has a better polishing effect to high-hardness metal materials such as high-carbon steel, also has a better polishing effect to crisp and hard materials such as Cr2O3, ceramics, jade and quartz, and is capable of completely preventing the damage on the surface of a material to be polished, and free from generating scratches, black points, and particle surface residues during polishing.

There is disclosed a heating apparatus with electrostatic attraction function 1, comprising at least a supporting base 2, an electrode for electrostatic attraction 4 and a heating layer 5 that are formed on the supporting base, and an insulating layer 6 that is formed on the electrode for electrostatic attraction and the heating layer, wherein the electrode for electrostatic attraction and/or the heating layer are/is composed of pyrolytic graphite containing boron and/or boron carbide of 0.001-30% by weight in terms of boron concentration, and the insulating layer has an electric resistivity of 10⁶-10¹⁵ Ωcm. There is provided a heating apparatus with electrostatic attraction function, which has a high thermal shock resistance, no problem of delamination, a proper resistance value, and a sufficient electrostatic attraction force even in a medium and high temperature range of 500-800° C., which causes no breakage of devices due to leakage current, and which can be used stably during rapid rise and rapid drop in temperature.

The invention belongs to the technical field of air filter materials, and discloses a needled/melt-blown/spunbond composite filter material and a preparation method thereof. The preparation method comprises the steps that modified polypropylene master-batches are mixed with polypropylene slices, and then mixed granules are obtained; the mixed granules are made into a polypropylene fiber net, and needling reinforcement is conducted to obtain a dust-facing layer needled material; a fine filter layer melt-blown material is prepared from the mixed granules; polypropylene slices are made into a polypropylene fiber net, and hot-rolling reinforcement is conducted to obtain a supporting layer spunbond material; and the dust-facing layer needled material, the fine filter layer melt-blown material and the supporting layer spunbond material are placed on an electret condensing device to be subjected to electret condensing simultaneously, and online compositing is conducted through electrostatic attraction to obtain the needled/melt-blown/spunbond composite filter material. The composite filter material prepared by the preparation method can reduce filtration resistance and delay rising of thefiltration resistance in the loading filtration process to intercept small-particle-size particles, and the filtration efficiency and stability are higher.

A micro electromechanical relay opens and closes an electrical circuit by contact/separation between a fixed contact disposed on a base and a movable contact disposed on an actuator by driving of a movable electrode by electrostatic attraction by application of voltage between a fixed electrode disposed on the base and a movable electrode of the actuator. The actuator comprises a supporting portion disposed on the base, a beam portion extending in a cantilevered manner from the supporting portion, and a movable electrode and a movable contact elastically supported by the beam portion. The beam portion elastically supports, in order from the supporting portion end, the movable electrode and the movable contact. A slit is formed from the side of the supporting portion in the portion of the actuator connecting the beam portion and the movable electrode.

Example embodiments relate to a capacitive micromachined ultrasonic transducer (CMUT) having a nanopillar structure and a method of fabricating the same. The CMUT may include a conductive device substrate, a support defining a plurality of cavities corresponding to elements on the device substrate, a membrane on the support to form the plurality of cavities, an upper electrode on the membrane, and a plurality of nanopillars on at least one of the membrane and the device substrate exposed to the plurality of cavities.

The invention discloses a manufacturing method for arranging white mud on a Nixing pottery green body in a filling manner. The manufacturing method includes the processes of blank preparation, green body forming, drawing, carving, mud filling, drying and firing. In the mud filling process, a layer of aluminum oxide powder and a layer of carboxymethyl propyl cellulose are evenly spread in a carved groove, and then the white mud is arranged in the carved groove in the filling manner; the white mud is obtained by mixing east mud and west mud according to the weight ratio of 7-8 to 2-3, and then the Nixing pottery green body is formed according to a manufacturing process of the blank; and in the drying process, the green body with the mud arranged in the filling manner is treated for 1 min to 5 min under the condition of 10 MPa to 15 MPa, and natural air drying is conducted. According to the manufacturing method, the electrostatic attraction of the white mud and the green body can be enhanced greatly by adding aluminum oxide particles, the molecular long chain of the carboxymethyl propyl cellulose has the involvement and crosslinking functions so that the white mud and the blank can be tightly bonded together, and the green body further has certain water retention uniformity so that water removal can be more even, and cracking and falling off are avoided.

The invention discloses a method for preventing filler of Nixing pottery from disengaging and cracking. The method comprises the steps of blank preparing, blank forming, drawing, carving, filler filling, drying and firing; for the filler filling step, a carved groove is evenly scattered with a layer of alumina powder, and then the carved groove is filled with filling pug; for the drying step, the blank filled with the pug is treated for 1 min to 5 min under the condition of 10 Mpa to 15 Mpa, and then natural air-drying is conducted. Compared with the prior art, according to the method for preventing the filler of the Nixing pottery from disengaging and cracking, alumina particles are added into the carved groove, the electrostatic attraction between the filled pug and a blank body can be greatly increased, and disengaging and cracking of the filled pug in the firing process can be greatly reduced.

The invention relates to a method and system for exhaust particulate matter sensing. Methods are described for increasing the sensitivity of particulate matter detection in an exhaust system of a vehicle. An example particulate matter sensor assembly comprises a pair of planar interdigitated electrode structures held at a voltage bias with respect to each other. An alternate embodiment may comprise a planar interdigitated electrode pair, and a conducting plate assembly again held at a voltage bias with respect to the planar interdigitated electrode pair. The bias may overlay an additional electric field drive, which improves the capture of soot particles on the sensor assembly surface thereby increasing sensitivity of particulate matter sensors.

The invention belongs to the technical field of dye chemical industry and discloses a dyeing method based on a cotton fabric active dye cationic modifier. The dyeing method comprises the following steps: (1) carrying dyeing treatment by adding cotton fiber into a glutamate aqueous solution or a phenylalanine salt aqueous solution, carrying out temperature-increasing treatment, taking the cotton fiber out, washing the cotton fiber to obtain modified cotton fiber; (2) carrying out dyeing treatment by dyeing the modified cotton fiber according to a conventional process, wherein the content of reactive dye in a dyeing solution is 1-2wt%, the content of sodium carbonate is 5-10g/L, the content of sodium chloride is 23-30g/L, and dyeing for 40-60 minutes under the dyeing condition at the temperature of 50-70 DEG C; and (3) carrying out aftertreatment of the dyed cotton fiber according to the conventional process to obtain the dyed cotton fiber. The method is capable of not changing all the properties of the cotton fabric after carrying out aftertreatment, even obtaining excellent dyeing effect, effectively reducing the consumption of salt and alkali, achieving low-temperature dyeing, achieving environment-friendly dyeing and reducing the cost.

An image forming apparatus includes an image bearing member; a stretched rotatable belt member; a transfer member for forming a toner image onto a recording material carried on the belt member; a separation roller, for stretching the belt member; a push-up device for pushing up a belt surface of the belt member; a pre-separation charging device, for electrically charging the recording material with a voltage of an opposite polarity to a normal charge polarity of a toner; and an execution portion for executing an operation in which the recording material charged by the voltage to the pre-separation charging means is separated from the belt member by pushing up the belt member by the push-up device.

The invention belongs to the field of water treatment, and discloses a modified composite adsorbent as well as a preparation method and application thereof. The preparation method of the modified composite adsorbent comprises the following steps: adding an aluminum salt aqueous solution into an alkaline solution under stirring until the pH value of an obtained solution is 6.5-7.5, heating an obtained suspension in a sealed manner, filtering, washing, drying and heating to obtain aluminum oxide; adding aluminum oxide in an acetic acid solution of chitosan, adding glutaraldehyde to form a colloid, drying, grinding, washing, drying, adding an obtained chitosan composite aluminum oxide into deionized water, adding a cationic surfactant, stirring, filtering, washing with ethanol and deionizedwater, and drying to obtain a finished product. The preparation method of the modified composite adsorbent is simple, and the adsorbent has the advantages of strong adsorption capacity, high adsorption efficiency on ionic dyes, easiness in separation from a reaction solution, no secondary pollution to the environment and the like, can effectively adsorb the ionic dyes in printing and dyeing wastewater, and is suitable for treating the printing and dyeing wastewater containing the ionic dyes.

The invention relates to a preparing method of a flexible carbon nanotube/metal composite film applied to the electromagnetic shielding field, and relates to a method for improving the existing nanotube film electromagnetic shielding effectiveness by growing metal particles on the carbon nanotube film surface. The preparing method sequentially comprises the following steps that firstly, the surface morphology of the carbon nanotube film is constructed; secondly, electrodeposition liquid is prepared; thirdly, a cathode deposition component is assembled; and fourthly, the metal particles are grown on the surface of the carbon nanotube film. The carbon nanotube film obtained by the method has high conductivity, excellent flexibility and light weight, and the adopted method and equipment are simple, cost is low, pollution is avoided, repeated use can be achieved, and the electrodeposition process can achieve the characteristics of industrialization and the like.

The invention discloses high-stability colloidal foam for inhibiting oxidation self-heating of a loose coal body and a preparation method of the high-stability colloidal foam. The high-stability colloidal foam is prepared from the following raw materials in percentage by weight: 58-80% of water, 19-40% of fly ash, 0.4-0.8% of an air entraining agent, 0.2-0.6% of a film coating agent and 0.2-0.6% of a cross-linking agent. The preparation method of the high-stability colloidal foam comprises the following steps: firstly, weighing the fly ash and the film coating agent in proportion, adding the fly ash and the film coating agent into water, and fully stirring to obtain a uniform fly ash suspension; adding the air entraining agent into the fly ash suspension in proportion, quickly stirring for 5-10 minutes, and preparing fly ash foam through an air entraining foaming expansion process; and finally, adding the cross-linking agent in proportion, and stirring for 3-5 minutes to obtain the high-stability colloidal foam. The high-stability colloidal foam disclosed by the invention is good in heat-resistant stability and excellent in flame retardant property, can keep moisture for a long time and wet a coal body, has a good wrapping and bonding effect on loose coal bodies such as residual coal in a mine goaf, fire coal in a coal field fire area and the like, and can form a layer of coating film on the surface of the coal body to isolate oxygen for a long time.

The invention relates to a urea-free ink-jet printing pretreatment solution suitable for a wool fabric and a pretreatment method. The pretreatment solution comprises the following components of, in percentage by mass, 0.5% - 3% of a polymer, 0.5% - 2% of a quaternary ammonium salt type cationic surfactant, 0.1% - 4% of a pH adjusting agent, and the balance water. The pretreatment solution is applied to the surface of the wool fabric through a padding or coating method to obtain a pretreated fabric with the solution carrying rate of 60% - 100%. The ink-jet printed wool fabric prepared by the ink-jet printing pretreatment is high in apparent color yield, good in definition and brighter in color.

The invention relates to the field of concrete admixtures, in particular to a synthetic method of an admixture for rockfill concrete production. The admixture for rock-fill concrete production is prepared from the following components in parts by weight: 300-380 parts of methyl allyl polyoxyethylene ether; 3-47 parts of acrylic acid; 1.0 to 55 parts of hydroxyethyl acrylate; 1.0 to 15 parts of acrylamide; 5 to 40 parts of 2-acrylamide-2-methallyl sulfonic acid; 5 to 20 parts of dimethyl diallyl ammonium chloride; 1-8 parts of hydrogen peroxide; 0.2 to 2.0 parts of a reducing agent; 0.5 to 2.6 parts of mercaptopropionic acid; and 400 to 641.6 parts of deionized water. The admixture for rockfill concrete production is excellent in performance, the use amount of a cementing material can be reduced, the problem that an existing admixture is poor in adaptability to rockfill concrete and gravel is solved, the admixture has good water reducing performance and plasticity maintaining performance, the use amount of the water reducing agent can be reduced during compounding, and a mixture is good in performance, free of bleeding and free of bottom grabbing; the water reducing agent has certain water reducing property, the use amount of the water reducing agent is reduced when the water reducing agent is compounded, and the use effect is good; the consumption is small and the cost is saved; and the method is environment-friendly.

The invention discloses a Nixing pottery filling technology. The Nixing pottery filling technology comprises blank preparation, blank molding, painting, engraving, pottery filling, drying and sintering. The pottery filling process comprises uniformly scattering a layer of iron oxide powder in an engraved groove and filling the engraved groove with filling pottery. The drying process comprises treating the blank filled with the pottery under pressure of 10-15Mpa for 1-5min and carrying out natural air drying. Compared with the prior art, iron oxide particles are added into the engraved groove so that electrostatic attraction between the filling pottery and the blank main body is greatly improved and filling pottery falling and cracking are greatly reduced in sintering.